Carboy rhymes with:
attaboy, brayboy, busboy, cowboy, doughboy, farmboy, highboy, lamboy, littleboy, playboy, schoolboy, tomboy
Carboy sounds like:
carafe, carava, caraveo, carbo, carby, caribe, caribou, carob, carp, carpio, carriveau, carrubba, carve, carvey, cerf, cervi, charpie, cherub, chirp, chirpy, chorba, corbo, corbu, corby, corp, corrib, corriveau, corva, corvo, cosgriff, cosgrove, crab, crabb, crabbe, crabby, craib, crap, crapo, crappie, crappy, crave, cravey, creep, creepy, cref, crepe, crepeau, crib, cribb, crip, cripe, croff, crop, cropp, croup, crupi, crybaby, cuervo, curb, curbow, curby, curfew, curve, curvy