Here's what rhymes with oncession.
session cession accession concession confession obsession possession aggression succession oppression recession secession impression profession compression procession regression suppression intercession expression depression discretion progression repression digression transgression decompression indiscretion dispossession retrogression Words that almost rhyme with oncession
seven heaven lesson lessen resin leaven eleven section felon heron conception infection mention tension affection convention invention weapon pension threaten inception lemon reckon convection freshman ascension headman leaden melon headmen attention direction connection election exception perception selection chairman correction injection inspection objection perfection reception connexion contention complexion deception dissection erection insurrection resection tendon defection dissension ejection inflection dentin lengthen pepsin henchmen pectin sexton question collection extension intention reflection detection dimension prevention rejection apprehension brethren intersection intestine resurrection retention strengthen suspension congestion deflection detention exemption subjection imperfection ingestion condescension dejection distension abstention declension indirection interception reflexion protection intervention suggestion rebellion comprehension hypertension projection redemption digestion contraception misconception disaffection disinfection distention inattention pretension reelection circumspection preemption redirection watermelon recollection introspection contravention indigestion disconnection predilection interconnection misapprehension