Adamant rhymes with:
condiment, impediment, sediment, 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, supplement, temperament, tenement, testament, tournament, vehement
Adamant sounds like:
adenoid, admit, admitted, atonement, attained, attainment, attend, attended, attendee, attenuate, attenuated, attuned, auditioned, authement, automata, automate, automated