Concoctions rhymes with:
auctions, abductions, abstractions, action's, actions, addictions, affections, afflictions, attractions, auction's, auctions, classactions, collections, complexions, confections, conjunctions, connections, constrictions, constructions, contractions, contradictions, convictions, corrections, deductions, defections, depictions, directions, dissections, distinctions, distractions, dysfunctions, election's, elections, erections, evictions, exactions, extinctions, extractions, factions, fictions, fractions, frictions, functions, imperfections, infections, inflections, infractions, injections, injunctions, inspections, instructions, interactions, interconnections, interjections, intersections, introductions, jurisdictions, malfunctions, objection's, objections, obstructions, predictions, predilections, production's, productions, productions', projections, protections, reactions, recollections, reconstructions, reductions, reflections, rejections, reproductions, restrictions, sanction's, sanctions, sanctions', satisfactions, section's, sections, selections, transaction's, transactions
Concoctions sounds like:
coincidence, coincidences, coinciding, communicating, communication's, communications, communications', conceding, concocting, conjugations, connecting, connections, consistence, consistency, consisting, constance, constancy, constituencies, constituency, constituting, constitution's, constitutions