biological warfare vs warfare

biological warfare and warfare both are nouns.

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

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

biological warfare: the use of bacteria or viruses or toxins to destroy men and animals or food
warfare: the waging of armed conflict against an enemy

Other hypernyms of biological warfare include war.

biological warfare (noun)	warfare (noun)
the use of bacteria or viruses or toxins to destroy men and animals or food	the waging of armed conflict against an enemy
	an active struggle between competing entities