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