Here's what rhymes with decylammonium.
                        
                        
                    
                                ammonium  meconium  harmonium  plutonium  zirconium  polonium  pandemonium  Words that almost rhyme with decylammonium
chromium  amazonian  draconian  sodium  podium  linoleum  niobium  rhodium  europium  holmium  symposium  dysprosium  petroleum  opprobrium  colloquium