gladiator vs belligerent

gladiator and belligerent both are nouns.

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

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

gladiator: (ancient Rome) a professional combatant or a captive who entertained the public by engaging in mortal combat
belligerent: someone who fights (or is fighting)

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

gladiator (noun)	belligerent (noun)
(ancient Rome) a professional combatant or a captive who entertained the public by engaging in mortal combat	someone who fights (or is fighting)
a professional boxer

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