combat vs warfare

combat and warfare both are nouns.

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

combat (noun)	warfare (noun)
an engagement fought between two military forces	the waging of armed conflict against an enemy
the act of fighting; any contest or struggle	an active struggle between competing entities

combat (verb)	warfare (verb)
battle or contend against in or as if in a battle