The term ROUND ENDER can be solved by two crossword solutions: BELL and GONG. A bell is a percussion instrument that produces a ringing sound when struck, usually made of metal or other hard material. It is often used to signal the end of a round in sports or other competitions. A GONG is a percussion instrument that produces a loud, resonant sound when struck. It is also often used to signal the end of a round in sports or other competitions.