Here's what rhymes with ultrarational.
relational rotational translational correlational locational probational educational occupational operational vocational recreational observational vibrational generational gestational ideational subnational variational mutational avocational aberrational computational informational motivational sensational situational congregational foundational navigational associational invitational organizational gravitational conversational denominational organisational representational conformational inspirational transformational confrontational coeducational improvisational nonoccupational nonvocational noneducational nonoperational intergenerational nondenominational nonrepresentational interdenominational Words that almost rhyme with ultrarational
occasional available capable payable attainable saleable salable breakable trainable assailable bailable claimable gradable obtainable insatiable traceable changeable debatable unshakable repayable unbreakable unshakeable degradable unsaleable erasable irreclaimable unsalable reclaimable resalable incapable sustainable unavailable unattainable unchangeable ascertainable irreplaceable unassailable inflatable replaceable untraceable persuadable conveyable biodegradable explainable unobtainable maintainable mistakable embraceable nonbreakable unmistakable inescapable interchangeable exchangeable unsustainable microwavable nonexchangeable noninterchangeable