reactivate reactionary razor resoluble resistant rifle ridiculous ridicule riddle ribbon rib rheumatoid rickets rhinitis rheumatism revolve revolt revive revitalize revision revise reversion reversible reverse revenue revenge reveal reunion reunification retrograde retrieve retreat retract retire retina reticular retention retell retard retail resume resultant restriction restrict restraint restore restrain responsible responsibility response respond respire respiration respective resort resonate resonance resolution resolute resin resignation resign residue residual resident residence reside reservoir reserve resent resemble resemblance resect rescue requisite reputation repulsion reproduce reproach repression representative repress represent replicate repetition repent repel render repeal renal removal remnant remittent remit reluctant remedy reluctance religious religion relieve relief relic reliable reliability relevant relevance relay relaxant relapse reinforce reign rehearsal rehabilitate regression regimen refute refusal refreshment refresh refugee refrain refractory refine referral refluent reel recur recumbent rectum rectitis rectify recruit recrudesce recreation reconstruct recondition reconciliation reconcile recommendation recommend recombination recollect recoil recline reclaim reckon recite recklessly reck reciprocal recipient recipe receptacle recede reassure rebuke rebellious rear reap ream realm reagent ravage rationale rational ration rating ratify rash rascal rarity rancher ramble rally ramify rale rake rail raid rage rag radius radiotherapy radiology radicle radiograph radioactive radical radiation radiate radial rack racial racist racism rust rabies rural rupture rug ruby royalty rubella royal rub row routine rough rotten rotary rot roller roll rod robe robbery roast rivalry rival ritual ripen ripe roar rip riot rinse rim rigorous rigor rigid rift