Here's what rhymes with pentitentiary.
century penitentiary plenipotentiary Words that almost rhyme with pentitentiary
testamentary rudimentary alimentary sedimentary parliamentary documentary supplementary complimentary uncomplimentary sensory treachery plenary beggary lechery peppery memory treasury jeopardy tenderly celery dispensary reverie feathery leathery directory lethargy rectory intercessory accessory trajectory cleverly westerly peremptory exemplary refectory extrasensory northwesterly southwesterly