boxer vs belligerent

boxer and belligerent both are nouns.

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

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

Other hypernyms of boxer include battler, combatant, fighter, scrapper.

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

boxer (adjective)	belligerent (adjective)
	characteristic of an enemy or one eager to fight
	engaged in war