Accession rhymes with:
succession, succession, concession, intercession, obsession, precession, procession, recession, retrocession, secession, session, succession
Accession sounds like:
aachen, aasen, accion, acecomm, achaean, acheson, ackman, acme, acne, acumen, acuna, acuson, aegean, aegon, again, agamemnon, agan, agana, agawam, agin, agna, agne, agnew, agony, aickin, aiken, aikin, aikman, ajami, akamine, akana, aken, akin, akiyama, akyanama, aoshima, aquino, asahan, asean, ashame, ashen, ashman, asiain, asian, asimow, asinine, askin, asman, assassin, assign, assume, aswin, aucoin, ausman, auzenne, awaken, awesome, axiom, axon, axsom, aygen, azcona