Here's what rhymes with onceproductive.
                        
                        
                    
                                productive  unproductive  reproductive  inductive  seductive  conductive  nonproductive  destructive  obstructive  constructive  instructive  counterproductive  superconductive  reconstructive  nondestructive  nonconstructive  Words that almost rhyme with onceproductive
ablative  propulsive  irruptive  repulsive  transitive  subjunctive  disjunctive  eruptive  locative  fricative  appositive  assumptive  mutative  combustive  lenitive  compulsive  disruptive  impulsive  presumptive  vocative  convulsive  consumptive  proliferative