r2
+ the common people, the rabble
- arms race
+ drag race
+ the human race
+ a hurdle race
+ entered the presidential race
+ obstacle race
+ relay race
+ sack race
- to disqualify from the race
+ three-legged race
+ trotting race
+ the races
+ harness racing
+ horse racing
+ kart racing
+ 1956, Ingels and kart racing
+ Grand Prix motor racing
+ 1894, France and Grand Prix motor racing
+ plate rack
+ tennis racket
+ radio detection and ranging, radar
+ the bat and the radar
+ 1940, Watson-Watt, A. Wilkins, Bowen, and the radar
+ electromagnetic radiation
+ llaser, ight amplification by stimulated emission of radiation
+ Chinese radicals
+ 1716, Kangxi Dictionary and Chinese radicals
+ heard it over the radio
+ radioactivity
+ 1896, Becquerel and radioactivity
+ a radioactive element, radium
+ 1898, Curies and radium
+ life raft
- air raid
+ guide rail
+ electric railway
+ 1879, Siemens and the electric railway
+ model railway
+ a transcontinental railway, Canadian Pacific Railway
+ Canadians, Chinese, and the Canadian Pacific Railway
+ 1881-1885, Macdonald and the Canadian Pacific Railway
+ a network of railways
- acid rain
+ 1852, R. Smith and acid rain
- heavy rain
- intermittent rain
+ sought shelter from the rain
+ made up of 7 colors, rainbow
+ Noah and the rainbow
+ the rains
+ Random-access memory, RAM
+ an uncastrated male sheep, ram
+ battering ram
+ charging, discharging and refreshing a storage capacitor, dynamic RAM
+ 1966, Dennard and dynamic RAM
+ using a flip-flop transistor circuit, static RAM
+ 1969, J. Schmidt and static RAM
+ a sign of the zodiac, the Ram
+ the mink ranch
+ at random
+ at close range
+ mountain range
+ forest ranger
+ radar, radio detection and ranging
+ sonar, sound navigation and ranging
+ people of rank
+ ordinary soldiers, the ranks
- to hold for ransom
- a ransom computer software, ransomware
- 1989, Popp and ransomware
- the ideation of a rapist; to rape, rape, rape
- to have sexual intercourse without the consent of the woman, to rape
+ feeling intense delight, in raptures
- nettle rash
- a large rodent, rat
+ 1828, a white rat, laboratory rat
+ white rat
+ at any rate
+ death rate
+ flat rate
+ mortality rate
+ prime rate
+ tax rate
+ piece rates
+ a credit rating
+ 1 to 1.6, golden ratio
+ 400s BC, Phidias and the golden ratio
- in the raw
- cosmic rays
+ 1910, Wulf and cosmic rays
+ gamma rays
+ 1900, Villiard and gamma rays
+ to shave with shaving cream and a razor
+ electric razor
+ 1917, Schick and the electric razor
+ safety razor
+ 1901, Gillette and the safety razor
- an allergic reaction
+ chain reaction
+ to set off a chain reaction
+ artificial nuclear chain reaction
+ 1942, Fermi and artificial nuclear chain reaction
+ the sun and the artificial nuclear reactor
+ mind reader
+ writer and readers
+ lip reading
+ worth reading
+ all ready
+ at the ready
- lost his grip on reality
+ the creation of a hyper-realistic artificial world, virtual reality
+ 1985, Lanier and virtual reality
- lost his reason
- turned upon me for no reason
+ within reason
+ will do anything within reason
+ for a variety of reasons
+ sound reasoning
+ quelled the rebellion
+ squashed the rebellion
+ on the rebound
+ total recall
+ accounts receivable
- in receivership
- got a cold reception
- got a cool reception
- got a lukewarm reception
+ got a warm reception
+ wedding reception
+ to leave a message with the receptionist
- in recess
- 2007-2009, the Great Recession
- in recession
- blood type AB, an universal recipient
+ day of reckoning
+ crime reconstruction
+ to set a new record
+ on record
- to have a police record
+ for the record
- off the record
+ magnetic tape recorder
+ 1898, Poulsen and the magnetic tape recorder
+ magnetic recording
+ tape recording
+ 1935, Pfleumer and tape recording
+ smashed previous records
+ a reference book, Guinness World Records
+ 1955, Beaver, McWhirters, and Guinness Worlds Records
+ a batch of recruits
+ the woman in red
+ Rose Red
- in the red
- was caught red-handed
+ barrier reef
- to defeat our hopes for reform
+ initiated certain reforms
+ radical reforms
+ refrigerator
+ 1862, Harrison and the refrigerator
- a blunt refusal
+ to give him my regards
- arid regions
- the nether regions
+ cash register
+ 1879, Ritty and the cash register
+ parish register
- the reversion to an earlier stage of development, regression
- a primitive defense mechanism, regression
+ to send my regrets
+ to correspond regularly
+ flying reindeer
- I reject
+ nearly related
+ public relations
+ race relations
- strained relations
- love-hate relationship
- to damage relationships
- to destroy relationships
+ a close relative
+ the warping of space and time by gravity, General Theory of Relativity
+ 1915, Einstein and the General Theory of Relativity
+ all motion is relative; Special Theory of Relativity
+ the speed of light within a vacuum is always the same; Special Theory of Relativity
+ time is the fourth dimension related to space; Special Theory of Relativity
+ 1905, Einstein and the Special Theory of Relativity
+ to contract and relax
+ 1936, the Olympic torch relay
+ operating in relays
+ a happy release
+ press release
+ instant relief
+ to provide relief
+ rapid eye movements, REM
- on remand
- casual remark
- an innocent remark
- missed that remark
- bitter remarks
+ critical remarks
- cutting remarks
- offensive remarks
+ a desperate remedy
+ an infallible remedy
+ I remember
+ urban renewal
+ for rent
- beyond repair
+ under repair
+ mosquito repellent
+ instant replay
+ an affirmative reply
+ a discreet reply
- a negative reply
+ RSVP, please reply
+ to await your reply
- an adverse report
+ a draft report
+ interim report
+ documented my report
- to leak the news to a reporter
+ inquiring reporter
+ investigative reporting
- in repose
+ proportional representation
+ House of Representatives
+/- a less primitive and more mature defense mechanism, repression
+/- the unconscious blocking of unacceptable memories, repression
- to retaliate, to take reprisals
+ above reproach
+ beyond reproach
+ USSR, Union of Soviet Socialist Republics
+ built up a reputation
- a doubtful reputation
- sullied my reputation
- unsavory reputation
+ by request
- refused my request
+ on request
- turned a deaf ear to our requests
+ to search and rescue
+ market research
+ close resemblance
+ without reservation
+ to accept the plan in principle but to have certain reservations
+ gold reserve
+ in reserve
+ a Cabinet reshuffle
+ in residence
+ to take up my residence
+ the line of least resistance
- uncooperative, passive resistance
- sales resistance
+ New Year`s resolutions
+ as a last resort
+ deploying my resources
+ natural resources
+ rich in natural resources
- imposed a great strain on our resources
+ pooled our resources
+ untapped resources
+ as a mark of respect
+ to pay his last respects
+ different from them in many respects
+ to pay my respects
+ an oxygen intake and carbon dioxide output, animal respiration
+ artificial respiration
+ a carbon dioxide intake and oxygen output in darkness, plant respiration
+ call and response
+ to commensurate with the responsibilities
+ to assume the extra responsibility
+ at rest
+ to set my mind at rest
+ the rest
+ to come to rest
+ to lay to rest
+ the net result
+ to get results
+ the Resurrection
+ CPR, cardiopulmonary resuscitation
- mental retardation
+ information retrieval
- beyond retrieve
+ in retrospect
+ pending his return
+ to give and expect in return
- point of no return
+ tax return
+ income tax return
+ an international news agency, Reuters
+ 1851, Reuter and Reuters
+ internal revenue
+ the Reverend
+ sexual role reversal
+ seahorse and sexual role reversal
+ under review
- 1966-1976, Mao and the Cultural Revolution
+ to develop disease resistant and high-yield crop varieties, Green Revolution
+ 1945, Borlaug and the Green Revolution
+ early 1800s, Industrial Revolution
+ revolver
+ 1835, Colt and the revolver
+ a just reward
+ to gain rewards
+ nursery rhyme
+ rhythms of around a day, circadian rhythms
+ 1729, de Mairan and circadian rhythms
+ mimosa and circadian rhythms
+ blue ribbon
+ a cereal plant grown in hot climates, rice
+ edible, cooked rice
+ to eat rice
- not edible, uncooked rice
+ not closely related to rice, wild rice
+ Canada and wild rice
+ to strike it rich
+ the rich
+ a two-wheeled cart pulled by one man with one passenger, rickshaw
+ 1869, Izumi and the rickshaw
+ to thumb a ride
+ free ride
- a sharp ridge
+ a long gun cut with helical grooves to make the bullet spin when fired, rifle
+ repeating rifle
+ 1860, C. Spencer and the repeating rifle
+ an oil rig
+ a test rig
+ all right
+ left and right
+ right and right and right
+ if their forecast had been right
+ by right
+ to serve him right
+/- left or right
+ stage right
+ the Right
+ in the right
+ to take the first turn on the right
+ to turn right
+ animal rights
+ by rights
+ to have the exclusive rights
+ do not infringe upon his rights
+ acted within his rights
+ human rights
+ visitation rights
+ women's rights
+ more conservative or traditional, right-wing
+ benzene ring
+ 1865, Kekule and the benzene ring

+ boxing ring
+ smashed the drug ring
+ engagement ring
- a natural ring of mushrooms, fairy ring
+ key ring
+ a ring worn on the little finger, pinkie ring
+ signet ring
+ teething ring
+ the ring
+ wedding ring
+ skating rink
- race riot
+ rest in peace, R.I.P.
+ to look ripe
+ an early riser
+ calculated risk
- not a good risk
- at my own risk
- to take risks
- fell into river
+/- arrayed his forces along the river
- farther down the river
+ to drag the river
+ the course of the river
+ a wide river
+ arterial road
+ a fast road
+ ring road
- a serpentine road
+ side road
+ 207 BC, Silk Road
+ a network of trade routes from China to the Mediterranean Sea, Silk Road
+ 2013, from China to Europe, New Silk Road
+ rule of the road
+ on the road
- no through road
+ toll road
+ major roads
+ minor roads
+ the lion roars
- an ideation of a robber; to rob, rob, rob
+ police and robbers
+ did time for robbery
+ robot
+ 1921, Capek and the robot
+ hard rock
+ a pillar of rock
- pop music that involves outrage and shock effects, punk rock
- soft rock
+ rocket
+ to launch a rocket
+ 1926, Goddard and the rocket
+ a multistage rocket
+ a hand game, rock-paper-scissors
+ 206 BC-AD 220, China and rock-paper-scissors
- sedimentary rocks
+ fishing rod
+ sectional fishing rod
+ lightning rod
+ 1752, Franklin and the lightning rod
+ the rod
- the pirates' black flag with a white skull and crossbones, Jolly Roger
+ central sulcus, fissure of Rolando
+ 1809, Rolando and the fissure of Rolando
+ rock and roll
+ late 1940s-early 1950s, Americans, and rock and roll
+ egg roll
+ 1872, a sponge cake roll, Swiss roll
- the thunder rolled
+ paint roller
+ 1940, Breakey and the paint roller
+ to start the ball rolling
+ Read-only Memory, ROM
+ spent a holiday in Rome
+ to share a room
+ a perceptual distortion room, Ames room
- becoming a dwarf when standing in the near corner of a trapezoidal room, Ames room
+ becoming a giant when standing in the far corner of a trapezoidal room, Ames room
+ 1938, Ames and the Ames room
+ dining room
+ dressing room
+ emergency room
+ fitting room
+ guest room
+ ladies room
+ living room
+ locker room
+ to make room
- stole out of room
+ operating room
+ pool room
+ rage room
+ reading room
+ ready room
+ reception room
+ reference room
+ report room
+ rest-room
+ standing room
+ steam room
+ to do the room
- scattered all over the room
+ utility room
+ waiting room
+ ginger root
+ to take root
+ grass roots
+ to pull it up by the roots
+ guide rope
+ a children's game, jump rope
+ a flower, rose
+ a fairy tale, Brier Rose
+ 1812, Brothers Grimm and Brier Rose
+ with large white flowers, musk rose
+ red rose
+ tea rose
- a rose having one circle of petals, wild rose
+ to grow roses
+ Europe and musk roses
- knew it only by rote
- working by rote
- in the rough
- treated me roughly
+ a casino game, roulette
+ 1796, France and the roulette
- a lethal game of chance, Russian roulette
- a player places a single round in a revolver, spins and shoots his head; Russian roulette
+ round and round
+ a daily round
- eliminated in the fourth round
+ in the round
- roundworm
+ the direct route
+ to plan my escape route
+ trade route
+ oil royalties
+ Royal Swedish Academy of Sciences, RSAS
+ please reply, RSVP
+ foam rubber
+ natural rubber
+ sponge rubber
+ synthetic rubber
+ 1909, F. Hofmann and synthetic rubber
+ sulfur-cured rubber, vulcanized rubber
+ 1839, Goodyear and vulcanized rubber
+ to set with ruby
- spoke with unwonted rudeness
+ area rug
+ Oriental rug
+ as a rule
+ Golden Rule
+ prospered under his rule
+ home rule
- an inflexible rule
+ slide rule
+ 1621, Oughtred and the slide rule
+ hard and fast rules
+ a set of rules
- rigid rules
+ managed to circumvent the rules
- to relax the rules
+ to conform to the rules
+ to comply with the rules
+ a ballroom dance, rumba
+ Cuba and the rumba
- an insidious rumor
+ to distinguish facts from rumors
+ home run
+ in the long run
+ ski run
- on the run
+ trial run
+ front runner
- gun runner
- gun running
+ the dog runs
+ the airplane and the runway
+ gold rush
+ the language of mirror images, Russian
+ State Anthem of the Russian Federation, the national anthem of Russia
+ 1993, white, blue and red horizontal fields; the flag of Russia
+ the State Duma, the President, and the Council of Ministers; the Govt. of Russia
+ recreational vehicle, RV
+ a medical prescription, ℞