Rear-guard, olfyddin, olwarchadlu
Rea-son, rheswm: rhesymu
Re-bate, rhigoli, toli
Re-bel, gwrthryfelwr: gwrthryfela
Re-bound, gwrthnaid: gwrthneidio
Re-build, adadeiladu, ailadeiladu
Re-buke, cerydd: ceryddu
Re-but, olgilio
Re-call, gwrthalw, adalw
Re-cant, dadgyffesu, dad-ddywedyd