Sperl rhymes with:
pearl, pearle, perl, perle, berle, birle, burl, curl, earl, earle, earll, erl, girl, hearl, herl, hurl, kerl, merl, merle, nerl, pearl, pearle, perl, perle, searl, searle, shirl, swirl, twirl, unfurl, whirl, whorl, wurl
Sperl sounds like:
several, severally, severely, soberly, sperle, spiral, spoerl, sprawl, sproul, sproule, sproull, sprowl, sprowle, spruell, spruiell, spruill