prizefighter vs boxer

prizefighter and boxer both are nouns.

Word	Noun	Adjective	Verb	Adverb
prizefighter	Yes	No	No	No
boxer	Yes	No	No	No

As nouns, boxer is a hypernym of prizefighter; that is, boxer is a word with a broader meaning than prizefighter:

Other hypernyms of prizefighter include pugilist.

prizefighter (noun)	boxer (noun)
a professional boxer	a breed of stocky medium-sized short-haired dog with a brindled coat and square-jawed muzzle developed in Germany
	someone who fights with his fists for sport
	a workman employed to pack things into containers