Here's what rhymes with protochloride.
                        
                        
                    
                                chloride  hayride  hydrochloride  tetrachloride  Words that almost rhyme with protochloride
rawhide  carbide  cockeyed  jockeyed  broadside  dockside  dioxide  peroxide  trioxide  godchild  deodorised  hydroxide  monoxide  categorised  equalised  stockpiled  superoxide  philosophised