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