Here is a list of nouns that start with RO.

roach, road, roadbed, roadblock, roadbuilding

roadhouse, roadside, roadster, roadway, roar

roaring, roast, robber, robbery, robe

robin, robot, robotism, rock, rocker

rocket, rocking, rococo, rod, rodder

rodding, rodent, rodeo, roemer, rogue

rok, role, roleplaying, roll, roller

romance, romantic, romanticism, romanticizing, romp

ronnel, roof, roofer, roofing, rooftop

rooftree, rookie, room, roomful, roommate

roost, rooster, root, rope, rose

rosebush, roster, rostrum, rot, rotation

rotenone, rotor, rotunda, rotundity, rouge

roughcast, roughneck, roulette, round, roundhead

roundhouse, rounding, roundup, route, routine

row, rowdy, royalty

Hope you enjoy this page of nouns that start with ro and the rest of this noun list a-z site as well.