belligerent vs doer

belligerent and doer both are nouns.

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

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

Other hypernyms of belligerent include actor, worker.

belligerent (noun)	doer (noun)
someone who fights (or is fighting)	a person who acts and gets things done

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