Sharpen rhymes with:
karpen, tarpon, karpen, tarpon, alagappan, aspen, campen, capen, cheapen, compean, copen, crippen, crispen, dampen, deepen, deppen, eappen, flippen, happen, hempen, hippen, kampen, karpen, kempen, koeppen, koppen, lappen, lupin, mcalpin, misshapen, open, phippen, pippen, poppen, reopen, ripen, rippon, saipan, stepan, supan, tappan, tappen, tarpon, thigpen, thomspon, tippen, turpen, vancampen, vankampen, weapon, yaupon, zupan
Sharpen sounds like:
sarafian, sarafin, sarafina, sarbane, sarofim, scarpino, scarpone, schreibman, scorpion, scriven, serafin, serafina, serafine, serafini, serafino, seraphina, seraphine, serbaine, serbian, serbin, serfin, servam, servan, servin, sharbono, sharfman, shribman, skirvin, sorbonne, sorvino