Complement rhymes with:
implement, implement, supplement, element, filament, implement, parliament, supplement, adamant, argument, armament, condiment, detriment, diamant, disarmament, element, excrement, experiment, filament, impediment, implement, increment, instrument, integument, ligament, ornament, orpiment, parliament, predicament, rearmament, regiment, sacrament, sediment, sentiment, supplement, temperament, tenement, testament, tournament, vehement
Complement sounds like:
complainant, complained, complaint, complemented, compliant, compliment, complimented, confluent