1) Battler 2) Belligerent 3) Boxer 4) Boxing competitor 5) Combatant 6) Fighter 7) Golden Gloves contender 8) Scrapper 1) Battler 2) Boxer 3) Combatant 4) Fighter 5) Palooka 6) Prizefighter 7) Stumblebum 
• (n.) One who fights with his fists; esp., a professional prize fighter; a boxer.
Pu'gil·ist noun [ Latin pugil .] One who fights with his fists; esp., a professional prize fighter; a boxer. 
Pugilist is an alternate term for a boxer
pugilist 1. Someone who practices the art of boxing. 2. A boxer, a fighter; figuratively, a vigorous controversialist (a person who likes to disagree with other people and say things that make people angry or think about a subject).
a person who fights with the fists; a boxer, usually a professional.
[SAT terms] someone who fights with his fists for sport