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