Weapon's rhymes with:
weapons, weapons', weapons, weapons', aspen's, aspens, cheapens, coppens, deepens, happens, lippens, opens, oppens, pippen's, reopens, saipan's, sharpens, tippens, weapons, weapons', yaupons
Weapon's sounds like:
waiving, wapping, waving, weapons, weapons', weaving, weavings, webbing, weeping, whipping, whooping, whopping, wiping