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