Here's what rhymes with pentathlum.
Words that almost rhyme with pentathlum
passion chasm fathom spasm plasm tation fashion ration fasten lation phantasm dispassion compassion assassin neoplasm diapason unfasten enthusiasm refashion refasten cytoplasm protoplasm iconoclasm datum madam tandem madame tantum sachem bantam talcum pablum handsome random maxim platinum stratum phantom ransom magnum tantrum hansom macadam transom memorandum amalgam sanctum gladsome sphagnum nonrandom tarmacadam substratum