Here's what rhymes with penicillin.
villain bouillon Words that almost rhyme with penicillin
serum theorem vision hidden fission silken sylvan thicken given position women addition written million edition kitchen listen mission physician television billion fiction arisen chicken civilian deposition linen risen imposition ribbon ridden bitten demolition magician pavilion pigeon envision kitten smitten audition riven stiffen children decision opinion definition division opposition commission driven permission prison provision admission ambition disposition friction petition suspicion collision emission incision inhibition intuition piston revision addiction affliction excision forgiven musician omission stricken attrition benediction derision diction erudition fruition sedition unwritten volition apposition dentition eviction inquisition intermission nonfiction pinion quicken striven trillion vermilion premonition condition religion tradition composition conviction transition acquisition precision proposition repetition supervision abolition ammunition coalition cognition dominion exhibition exposition nutrition partition politician prohibition submission crimson ignition remission supposition tuition admonition apparition encryption kinsmen preposition requisition rewritten technician christian imprison indecision interposition patrician rendition ascription dereliction interdiction logician midshipman overridden rhetorician underwritten competition jurisdiction recognition transmission expedition superstition clinician subdivision circumcision depiction contrition indisposition infliction redefinition disquisition manumission reptilian statistician theoretician unchristian description distinction decomposition extinction inscription prediction prescription restriction subscription conscription constriction mathematician transposition extradition precondition presupposition superposition electrician obstetrician pediatrician superimposition contradiction transcription crucifixion juxtaposition malnutrition predisposition proscription contradistinction