ruthless rusty rust rush ruin rug ruby rural rude rub royalty royal row rouse routine roundabout rough rotten rotation rotate rotary rot rope roof romantic romance roller roll role rod rocket rock robe robbery robber rob roast roar rival risk Roman rim rigid ripen rifle ripe ring ridiculous ridge rid rib rhythm reward riddle ribbon revolve revolutionary revolution revolt revise review reverse reveal revenge retreat retire retell retain resultant restriction restrict restraint restrain restore restless restaurant rest responsibility responsible respectively respective respectful respectable resort resolve resolution resistant resistance resident residence reservation resemblance resist resignation resign reservoir rescue requirement require request reputation reproduction reproduce reproach representative representation represent replacement replace repetition repent repel rent renew render remove removal remote remind remedy remarkable remark remains remainder remain reluctant religious religion relieve relief reliance relevant release relay relativity reliability relatively relative relationship relation relate rejoice reject reinforce rein reign rehearsal regulation regularly regularity regulate regret regime regenerative regular refute refrigerator refuge refreshment refresh reform reflection refine reflect reed rectify refinery recruit reel recreation reconcile reclaim recovery recommend recollect recognition reckon reciprocal recipe reception receipt recall rebellion rebel rear reap realm reality realistic rational readily reactor razor ray rat ratio rare rally rainbow rarely rake raid rage raw rag radius radium radioactivity radioactive radiator radiate radical radar racket rack racial rabbit