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