slugger vs boxer

slugger and boxer both are nouns.

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

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

Other hypernyms of slugger include pugilist.

slugger (noun)	boxer (noun)
(baseball) a ballplayer who is batting	a breed of stocky medium-sized short-haired dog with a brindled coat and square-jawed muzzle developed in Germany
a boxer noted for an ability to deliver hard punches	someone who fights with his fists for sport
	a workman employed to pack things into containers