Un rhymes with:
begun, bruhn, brun, brunn, bun, bunn, byun, c1, chun, chunn, done, donne, dun, dunn, dunne, fun, gruhn, grun, gun, gunn, homerun, huhn, hun, hunn, jun, kuhne, kun, lajeune, luhn, lun, lunn, m1, mcfun, mcmunn, mun, munn, none, nuhn, nun, nunn, one, outdone, outrun, overdone, puget-1, pun, redone, rerun, run, shun, simeone, son, spun, stun, sun, thrun, thun, ton, tonne, undone, won, youn, yun
Un sounds like:
ueno, um, uma, umana, umm, una, uneo, uni, union, uno, unum, unwin, uyeno