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