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