Armaments rhymes with:
argument's, arguments, complements, condiments, documents, elements, experiment's, experiments, filaments, impediments, implements, increments, instrument's, instruments, instruments', ligaments, monuments, ornaments, parliament's, parliaments, predicaments, regiments, sacraments, sediments, sentiments, supplements, temperaments, tenements, testaments, tournament's, tournaments
Armaments sounds like:
aeronautic, aeronauticas, aeronautics, arantza, arends, arendsee, arentz, armitage, armtec, armtek, armtek's, arnotts, arntz, aromatic, aronowitz, arrants