Risky is a synonym of dangerous. It begins with the letter r.
Ravishing is an "R" word that means lovely.
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rich is a synonym for delicious
radii
random
reduction
Renege.
trickier
raging, riotous, rough, ruinous.. :D
A three-letter word that means "exist" is almost always "are." See if it will work.
a synonym for slow beginning with the letter r is retard