late 14c., "rebel," agent noun from rise (v.). Meaning "one who rises" (from bed, in a certain manner) is mid-15c. Meaning "upright part of a step" is from 1771.
he's usually a late riser
rip-saw
ripsnorter
rip-tide
rise
risen
riser
risible
rising
risk
risky
Risorgimento
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