Here's what rhymes with impactum.
Words that almost rhyme with impactum
prolactin datum tantum bantam maxim phantom sanctum tantrum sachem talcum pablum handsome platinum stratum chasm fathom madam ransom spasm tandem madame plasm hansom transom random amalgam magnum macadam phantasm gladsome neoplasm sphagnum enthusiasm memorandum substratum nonrandom cytoplasm tarmacadam protoplasm iconoclasm