Penicillin rhymes with:
balilan, billon, bouillon, dhillon, dillan, dillen, dillon, dylan, gilfillan, gillan, gillean, gillen, gillon, guillen, hillen, kilen, killen, macmillan, mcgillen, mcmillan, mcmillen, mcmillon, mcquillan, mcquillen, mcquillin, millan, millen, millin, millon, nylen, philon, quillan, quillen, quillon, santillan, skillen, spillane, trilon, villain, willen
Penicillin sounds like:
pinkelman, punchline, punsalan