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