Thirty Years' War vs warfare

Thirty Years' War and warfare both are nouns.

Word	Noun	Adjective	Verb	Adverb
Thirty Years' War	Yes	No	No	No
warfare	Yes	No	No	No

Thirty Years' War (noun)	warfare (noun)
a series of conflicts (1618-1648) between Protestants and Catholics starting in Germany and spreading until France and Denmark and Sweden were opposing the Holy Roman Empire and Spain	the waging of armed conflict against an enemy
	an active struggle between competing entities