fighter vs belligerent

fighter and belligerent both are nouns.

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

As nouns, fighter and belligerent are synonyms defined as:

Other synonyms of fighter include battler, combatant, scrapper.

fighter (noun)	belligerent (noun)
a high-speed military or naval airplane designed to destroy enemy aircraft in the air	someone who fights (or is fighting)
someone who fights (or is fighting)
someone who fights for a cause

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