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