rabbit race racial rack rack one's brains radar radiation radical radio rag rage raid rail railroad railway rain rainbow rainy raise rally range rank rapid rare rarely rat rate rather rather than ratio rational raw ray reach react reaction read readily reading ready real realise realistic reality realize really realm rear reason reasonable rebel recall receipt receive receiver recent reception recession reckon reckon with reflect reflection recognise recognition recognize recommend recommendation record recorder recover recovery recreation recruit red reduce reduction refer refer to as refine reflexion regard refugee reform refresh refrigerator refusal refuse regarding regardless regardless of region register regret regular regulate regulation reinforce relate relation relationship relative relative to relativity relax release relevant reliable relief relieve religion religious reluctant rely remain remark remarkable remedy remember remind remote removal render renew rent repair repeat repeatedly repetition replace replacement reply report reporter represent representative reproduce republic republican reputation request require requirement rescue research resemble reservation reservoir residence resident resign resist resistance resistant resolution resolve resort resource respect respective respectively respond response responsibility responsible rest restaurant restless restore restrain restrict result resume retail retain retire retreat return reveal revenue reverse review revise revolt revolution revolutionary reward rhythm rib ribbon rice rich ride ride out ridge ridiculous rifle right right away rigid ring ring off ring up riot ripe rise rise above rise to risk rival river road roar roast rob robot rock rocket rod role roll roll in roll up roller romantic roof room root root out rope rope in rose rotten rough round round the clock round up rouse route routine row royal rub rub it in rubber rubbish rude rug ruin rule rule out ruler rumor rumour run across run away with run down run into run off run out run over run riot run through run to run up run up against rural rush rust