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