rabid racial racing racist radiant radical radioactive raging rainy raised rampant random rank ranking rapid rare rash rational rattling raucous reactive readable ready real realistic rear reasonable reasoned rebellious recent receptive recipient reckless reclusive recognizable recoverable recreational rectangular redundant reference refined reflective reform refreshing regenerate regional regular regulatory relational relative relaxed relentless relevant reliable relieved religious reluctant remaining remarkable remember reminiscent remnant remote renegade renewable renowned rental repeated repetitive replaceable replete replicate repressive reproductive reptile reputable required requisite reserved resident residential residual resigned resilient resistant resolved resonant resounding respectable respectful respective respiratory respondent responsible responsive restive restless restorative restrained restricted restrictive resurgent retardant reticent retired retiring revealing reverse reversible rewarding rich rickety ridiculous riding rife right rightful rigid rigorous ringing ripe ripping rising risky ritual roaring roast robust rocky rodent rolling romantic rosy rotten rough round rounded rousing routine royal rude rudimentary rugged ruling rumbling rundown running rural rusty ruthless