O'nuts rhymes with:
knuts, nut's, nuts, abuts, but's, buts, butts, butz, clutts, cuts, cutts, gluts, guts, hut's, huts, juts, klutts, kluttz, klutz, knuts, krutz, kutz, lutz, mutts, mutz, nut's, nuts, putts, putz, ruts, rutts, rutz, schmutz, schutz, shuts, shutts, slutz, struts, strutz, stutts, stutz, tut's, utz, what's
O'nuts sounds like:
omits, ondaatje, onondaga, ontko