Modems rhymes with:
odoms, adam's, adams, adams', addams, addendums, condoms, fiefdoms, freedom's, freedoms, kingdom's, kingdoms, mcadams, memorandums, needham's, odoms, oldham's, referendums, saddam's, sedums, sheikdoms, tandem's, wadhams
Modems sounds like:
maddening, madding, madness, madonna's, maidens, maintaining, maintains, maintenance, mandamus, mandating, manhattan's, matinees, mating, matting, meat-eating, medianews, mediating, meditating, meditations, mediums, mednick, meeting, meeting's, meetings, mending, mendonca, mendonsa, mentink, mentioning, mentions, methanex, mindedness, minding, minnetonka, minting, mitnick, mittens, monadnock, monatomic, monotonous, montana's, montanans, montanez, motioning, motions, motown's, mountain's, mountainous, mountains, mounting, mouthing, muddying, munitions, mutating, mutations, muting, mutinies, mutinous