Here's what rhymes with nonplenary.
                        
                        
                    
                                plenary  Words that almost rhyme with nonplenary
memory  treasury  treachery  reverie  leathery  lechery  century  sensory  lethargy  celery  rectory  beggary  feathery  peppery  directory  cleverly  jeopardy  tenderly  accessory  trajectory  alimentary  complimentary  westerly  dispensary  peremptory  refectory  intercessory  parliamentary  documentary  rudimentary  supplementary  sedimentary  penitentiary  uncomplimentary  exemplary  testamentary  northwesterly  extrasensory  plenipotentiary  southwesterly