proliferate
verb
multiply, increase in number
prove
verb
verify, substantiate, confirm
proven
adjective
established, verified
provoke
verb
incite, irritate, vex, enrage
purchase
verb
buy, procure
questionable
adjective
doubtful, suspicious, dubious
rarely
adverb
extremely seldom, infrequently
realm
noun
area, sphere, field, domain
reckless
adjective
indiscriminate, rash
refine
verb
upgrade, enhance
refined
adjective
purified, clarified, distilled
reflect
verb
meditate, think, consider, ponder
reflect
verb
demonstrate, display, show
reform
verb
revise, amend
refrain
verb
pause, stop, cease
register
verb
sign up, enroll
reluctant
adjective
unwilling, disinclined, loath, averse
render
verb
provide, give, afford, impart
renown
noun
fame, repute, distinction, reputation
repel
verb
drive away, repulse, parry
replace
verb
supersede, supplant, substitute
reproduce
verb
copy, duplicate, imitate
reproduce
verb
breed, multiply, spawn
reptile
noun
cold-blooded vertebrate
require
verb
demand, entail, call for
resemble
verb
be similar to, be like, take after
resist
verb
withstand, confront
resolve
verb
determine, decide
resolve
verb
find a solution for, solve
respectively
adverb
separately, individually
responsible
adjective
charged, liable, accountable, answerable
restrict
verb
limit, confine, restrain
result
noun
product, outcome, effect
rich
adjective
fertile, abundant, affluent, ample
risky
adjective
dangerous, hazardous, perilous
rival
noun
competitor, antagonist, opponent