gladiator vs boxer

gladiator and boxer both are nouns.

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

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

Other hypernyms of gladiator include pugilist.

gladiator (noun)	boxer (noun)
(ancient Rome) a professional combatant or a captive who entertained the public by engaging in mortal combat	a breed of stocky medium-sized short-haired dog with a brindled coat and square-jawed muzzle developed in Germany
a professional boxer	someone who fights with his fists for sport
	a workman employed to pack things into containers