Fester rhymes with:
amvestor, bester, brester, chester, ester, esther, hester, investor, ivester, jester, kester, leicester, lester, mclester, mester, mestre, molester, nester, nestor, pester, polyester, questar, requester, rester, semester, sequester, silvester, sylvester, sylvestre, tester, testor, trester, trimester, vestar, vester, westar, wester
Fester sounds like:
factor, factory, faster, feaster, fechter, feister, fichter, fiechter, fighter, fisheater, fister, fixture, foister, foster