Here's what rhymes with protoimperative.
                        
                        
                    
                                imperative  comparative  Words that almost rhyme with protoimperative
relative  decorative  genitive  negative  tentative  sedative  sensitive  competitive  insensitive  commemorative  executive  consecutive  contemplative  preventative  nonsensitive  representative  noncompetitive  oversensitive  argumentative  unrepresentative  nonconsecutive