civil war vs warfare

civil war and warfare both are nouns.

Word	Noun	Adjective	Verb	Adverb
civil war	Yes	No	No	No
warfare	Yes	No	No	No

As nouns, warfare is a hypernym of civil war; that is, warfare is a word with a broader meaning than civil war:

Other hypernyms of civil war include war.

civil war (noun)	warfare (noun)
a war between factions in the same country	the waging of armed conflict against an enemy
	an active struggle between competing entities