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