Tantrums rhymes with:
angstroms, nordstrom's, nordstroms, nostrums, spectrum's, spectrums, abram's, abrams, angstroms, doldrums, eproms, forum's, forums, nordstrom's, nordstroms, nostrums, pilgrim's, pilgrims, quorums, santorum's, seagram's, seagrams, seagrams', spectrum's, spectrums, tungsrom's
Tantrums sounds like:
tendering, tenderness, thundering