Aspen rhymes with:
crispen, thomspon, alagappan, 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, sharpen, stepan, supan, tappan, tappen, tarpon, thigpen, thomspon, tippen, turpen, vancampen, vankampen, weapon, yaupon, zupan