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