Gunnison rhymes with:
tunison, arneson, bennison, denison, dennison, jenison, jennison, johannesen, johannessen, kenison, kennison, kinnison, renison, tennison, tennyson, tunison, vanessen
Gunnison sounds like:
gamesman, gangemi, gansen, ganson, gemignani, genicom, genson, genzyme, giancana, gingham, goings-on, gymnasium