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