warfare vs struggle

warfare and struggle both are nouns.

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

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

Other hypernyms of warfare include battle, conflict.

warfare (noun)	struggle (noun)
the waging of armed conflict against an enemy	strenuous effort
an active struggle between competing entities	an energetic attempt to achieve something
	an open clash between two opposing groups (or individuals)

warfare (verb)	struggle (verb)
	be engaged in a fight; carry on a fight
	to exert strenuous effort against opposition
	climb awkwardly, as if by scrambling
	make a strenuous or labored effort