boxer
Word family
Synonym discussion
Sense: noun/1
These words overlap, but they are not used in exactly the same way. 'Boxer' is the normal everyday word for a person who does boxing, whether amateur or professional. 'Fighter' is broader: it can describe a boxer, but it also fits people in kickboxing, MMA, or other combat sports. 'Prizefighter' is an older or more journalistic word and usually points to a professional boxer who fights for money. 'Pugilist' is formal and literary, so it sounds unusual in ordinary conversation. In most cases, say 'She is a talented boxer.' Use 'fighter' when the sport is not boxing, and save 'pugilist' for stylized writing.
Etymology
This word was first formed in English from the verb 'box' and the suffix '-er', giving the meaning 'a person who boxes'. The dog-breed sense came later through German Boxer, the name for the breed developed in Germany. That breed name was probably influenced by the idea that the dog seems to spar with its front paws like a human fighter.