struggle vs warfare

struggle and warfare both are nouns.

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

As nouns, warfare is a hyponym of struggle; that is, warfare is a word with a more specific, narrower meaning than struggle:

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

struggle (verb)	warfare (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