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