Supplement rhymes with:
complement, implement, complement, element, filament, implement, parliament, adamant, argument, armament, complement, condiment, detriment, diamant, disarmament, element, excrement, experiment, filament, impediment, implement, increment, instrument, integument, ligament, ornament, orpiment, parliament, predicament, rearmament, regiment, sacrament, sediment, sentiment, temperament, tenement, testament, tournament, vehement
Supplement sounds like:
splendid, splint, supplant, supplanted, supplemented, swoveland