Vietnam's rhymes with:
balms, bomb's, bombs, brahms, calms, cdroms, com's, coms, dahms, guam's, hommes, homs, islam's, mccombs, mom's, moms, palms, pogroms, proms, qualms, rom's, roms, suddam's, thoms, tom's, toms, yom's
Vietnam's sounds like:
vadnais, vetoing, vetting, vietnamese, vitamins, vitanza, vividness, voiding, voting