Nydam rhymes with:
adam, addendum, afrikanerdom, boredom, cadam, carborundum, chiefdom, christendom, condom, corundum, dedham, dukedom, earldom, edam, fiefdom, fordham, freedom, gaddum, hildum, kingdom, leedom, macadam, madam, madame, martyrdom, mcadam, memorandum, modem, needham, odom, odum, officialdom, oldham, purdham, purdom, purdum, random, referendum, rodham, saddam, sandom, sedam, sedum, seldom, sheikdom, sodom, stardom, subkingdom, suydam, tandem, windham, windom, wisdom, wyndham
Nydam sounds like:
nadein, nadine, nandaime, natan, nathan, nathania, nathene, nation, natuna, nayden, needham, neoteny, netan, netanyahu, newton, newtonian, newtown, newtowne, nineteen, nodine, nomination, noontime, notation, nothin, nothin', notion, nowotny, nutone