Here's what rhymes with niven.
liven enliven thriven Words that almost rhyme with niven
bison hyphen siphon syphon horizon atheism bedizen ion einen lion tighten widen heighten lichen lighten ripen siren beiden liken scion hymen whiten titan enlighten fibrin frighten brighten fireman firemen baryon prion lineman linemen pinyon funnyman linesman finespun veniremen billycan aphelion cotyledon dandelion dicotyledon perihelion monocotyledon