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