rabbit race racial rack racket radar radiant radiate radical radio radioactive radius rag rage raid rail railroad rain rainbow raise rake rally random range rank rap rape rapid rare rarely rash rat rate rather ratio rational raw ray razor reach react read reader readily reading ready real realistic reality realize really realm reap rear reason reasonable reassure rebel rebellion recall recede receipt receive recent reception recipe recipient reciprocal recite reckless reckon reclaim recognition recognize recollect recommend reconcile record recorder recover recovery recreation recruit rectangle rectify recur recycle red reduce reduction redundant reed reel refer reference refine reflect reflection reform refrain refresh refreshment refrigerator refuge refugee refund refusal refuse refute regard regarding regardless regime region register regret regular regulate regulation rehearsal reign rein reinforce reject rejoice relate relation relationship relative relativity relax relay release relevant reliable reliance relief relieve religion religious relish reluctant rely remain remainder remains remark remarkable remedy remember remind remnant remote removal remove render renew renovate rent repair repay repeat repeatedly repel repertoire repetition replace replacement reply report reporter represent representative repression reproach reproduce reptile republic republican reputation request require requirement rescue research resemblance resemble resent reservation reserve reservoir residence resident resign resist resistance resistant resolute resolution resolve resort resource respect respective respond response responsibility responsible rest restaurant restless restore restrain restraint restrict result resultant resume retail retain retention retire retort retreat retrieve retrospect return reveal revelation revenge revenue reverse review revise revive revolt revolution revolutionary revolve reward rhythm rib ribbon rice rich rid riddle ride ridge ridiculous rifle right rigid rigorous rim ring riot rip ripe rise risk ritual rival river road roar roast rob robe robot robust rock rocket rod role roll romance romantic roof room root rope rose rot rotary rotate rotten rough round roundabout rouse route routine row royal royalty rub rubber rubbish ruby rude rug ruin rule ruler rumor run rural rush rust ruthless