The term 'BOUT ENDER' is a boxing term that refers to the end of a boxing match. The crossword solutions for this term are KAYO (4 letters), BELL (4 letters), and TKO (3 letters). KAYO is a term used to describe a boxer who has been knocked out by their opponent, BELL is the sound of the bell that signals the end of a round, and TKO stands for Technical Knock Out, which is when a referee stops the fight due to one boxer being unable to continue.