Processions rhymes with:
concessions, obsessions, recession's, recessions, session's, sessions, sessions', aggressions, concessions, confessions, depressions, digressions, discretions, expressions, freshens, impressions, indiscretions, obsessions, oppressions, possessions, profession's, professions, recession's, recessions, regressions, repossessions, repressions, session's, sessions, sessions', transgressions
Processions sounds like:
parisians, parking, parkins, parsimonious, parsing, parsonage, parsonages, parsons, pearson's, perchance, perishing, perking, perkins, perkins', perkins's, pershing, pershing's, pershings, persians, persing, person's, personic, personics, persons, persuasions, perusing, phrasing, piercing, praising, preaching, preakness, pregnancies, pregnancy, presaging, prescience, presence, presences, pressing, presumes, presuming, pricing, pricings, prisms, prison's, prisons, processing, prognoses, prognosis, prusinski, purchasing, purging, pursuing