Koestler rhymes with:
droessler, roesler, roessler, besler, bosler, bossler, busler, cansler, casler, chancellor, chesler, chisler, cisler, consular, councilor, counsellor, counselor, crisler, crysler, drechsler, droessler, duesler, eissler, esler, fansler, fesler, fisler, fosler, gensler, gessler, gieseler, giesler, gisler, gusler, hasler, hausler, haussler, heisler, hensler, hesler, hosler, hossler, hustler, insular, kasler, keisler, kensler, kesler, kinsler, kisler, kuenstler, kusler, meisler, mesler, mosler, neisler, nesler, nestler, peninsular, preisler, presler, roesler, roessler, rossler, sacilor, schisler, schissler, sesler, shisler, sisler, sponseller, sponsler, tesler, trisler, trusler, vosler, vossler, wesler, wieseler, wisler, wrestler, zeisler
Koestler sounds like:
kastler, kestler, ketler, kettler, kistler, kittler, kotler, kottler