belligerent vs fighter

belligerent and fighter both are nouns.

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

As nouns, belligerent and fighter are synonyms defined as:

Other synonyms of belligerent include battler, combatant, scrapper.

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

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