Here's what rhymes with prolegomenous.
foaminess Words that almost rhyme with prolegomenous
eponymous exogenous copiousness motionless homelessness brokenness smokiness soullessness woefulness hopelessness chauvinists emotionless wholesomeness loathsomeness lonesomeness precociousness ferociousness soulfulness dolefulness socialists boastfulness outspokenness globalists atrociousness proteolysis postmistress toastmistress ufologists unwholesomeness