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