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