Seldom rhymes with:
earldom, hildum, officialdom, oldham, 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, nydam, odom, odum, officialdom, oldham, purdham, purdom, purdum, random, referendum, rodham, saddam, sandom, sedam, sedum, sheikdom, sodom, stardom, subkingdom, suydam, tandem, windham, windom, wisdom, wyndham
Seldom sounds like:
saladin, saladino, salatino, saldana, salton, schlottman, scholten, schooltime, schulten, scialdone, seldane, selden, seldin, seldon, shackelton, shackleton, shelden, sheldon, shelton, skeleton, skelton, skilton, slaten, slaton, slatten, slatton, slayden, slaydon, slayton, sletten, slowdown, soldan, soldano, solution, sultan, sulton