Upturn rhymes with:
return, sauterne, stearn, stearne, stern, sterne, stirn, sturn, turn, adjourn, ahearn, ahern, aherne, alpern, amburn, bern, berne, burn, burne, byrne, cern, chern, cherne, churn, concern, dern, discern, durn, earn, erne, fearn, fern, hearn, hearne, hern, herne, hirn, hurn, kearn, kern, kirn, laverne, learn, mcgurn, mckern, new-bern, o'beirne, o'byrne, o'hearn, o'hern, obyrne, ohearn, ohern, return, sauterne, spurn, stearn, stearne, stern, sterne, stirn, sturn, thurn, turn, unconcern, urn, vern, verne, yearn, zurn