Concessions rhymes with:
obsessions, processions, recession's, recessions, session's, sessions, sessions', aggressions, confessions, depressions, digressions, discretions, expressions, freshens, impressions, indiscretions, obsessions, oppressions, possessions, processions, profession's, professions, recession's, recessions, regressions, repossessions, repressions, session's, sessions, sessions', transgressions
Concessions sounds like:
chang-ming, changing, cheng-chung, chengxiang, chenxiang, chongqing, cognizance, commencing, commission's, commissioning, commissions, commonsense, communism's, conchemco, concussions, conscience, consciences, consciousness, consensus, consequence, consequences, consumes, consuming, cunningham's