re-, red- (Latin: back, backward, again; used as a prefix).recalcitrant: 
recant: 
recapitulate: 
recapitulation: 
recede: 
receipt: 
receive: 
recitation: 
recite: 
reclaim: 
recline: 
recluse: 
recognition: 
recommend: 
recommit: 
reconvert: 
recount: 
recur: 
recurrence: 
recycle: 
rededicate: 
reduce: 
reduction: 
redundancy: 
redundant: 
reduplicate: 
refer: 
reference: 
reflect: 
reflection: 
reflex: 
reflexive: 
refrigerator: 
refuge: 
refugee: 
refuse: 
refute: 
regenerate: 
regress: 
regression: 
reject: 
rejection: 
rejoin: 
rejuvenate: 
rejuvenation: 
rejuvenator: 
relax: 
reluctant: 
remedial: 
remedy: 
remember: 
reminisce: 
remit: 
remittance: 
remunerate: 
remuneration: 
renovate: 
renovation: 
repatriate: 
repel: 
repellent: 
replicate: 
reply: 
report: 
repose: 
repository: 
repugnant: 
repulse: 
rescind: 
reside: 
residence: 
resident: 
residue: 
resilience: 
resilient: 
resist: 
resistance: 
resonance: 
resonant: 
resonator: 
respect: 
respiration: 
respirator: 
respire: 
resume: 
retain: 
retard: 
retort: 
retract: 
reverse: 
reversicon: 
reverso: 
review: 
revise: 
revision: 
revival: 
revive: 
revoke: 
revolt: 
revolution: 
revolve: 
revue: 
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