Here's what rhymes with serritium.
                        
                        
                    
                                tritium  Words that almost rhyme with serritium
iridium  meridian  presidium  praesidium  obsidian  amphibian  postmeridian  lithium  trivium  trillium  delirium  wearisome  beryllium  bacterium  equilibrium  condominium  disequilibrium