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