Here's what rhymes with postnatum.
stratum datum substratum Words that almost rhyme with postnatum
madam madame satin fatten latin batten platen madden happen imagine hadn cabin haben flatten macadam sadden gladden tarmacadam maxim platinum chasm fathom phantom spasm magnum plasm tantum sachem bantam handsome random amalgam ransom tandem sanctum tantrum hansom phantasm transom talcum pablum gladsome sphagnum memorandum cytoplasm protoplasm neoplasm nonrandom enthusiasm iconoclasm