combat vs war

combat and war both are nouns.

Word	Noun	Adjective	Verb	Adverb
combat	Yes	No	Yes	No
war	Yes	No	Yes	No

combat (noun)	war (noun)
an engagement fought between two military forces	the waging of armed conflict against an enemy
the act of fighting; any contest or struggle	a concerted campaign to end something that is injurious
	an active struggle between competing entities
	a legal state created by a declaration of war and ended by official declaration during which the international rules of war apply

combat (verb)	war (verb)
battle or contend against in or as if in a battle	make or wage war