Concession rhymes with:
accession, intercession, obsession, precession, procession, recession, retrocession, secession, session, succession
Concession sounds like:
cancan, cancienne, cancino, cancom, cancun, cangemi, cangiano, canson, canzano, chang-hsin, changchun, chiengmai, cinnaminson, cinnamonson, cinquemani, coenzyme, comecon, commision, commission, communism, concannon, concussion, conjoin, conkin, conshohocken, consign, consume, cookingham, cunningham, cyanazine, cynicism