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