enmity vs war

enmity and war both are nouns.

Word	Noun	Adjective	Verb	Adverb
enmity	Yes	No	No	No
war	Yes	No	Yes	No

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

enmity: a state of deep-seated ill-will
war: a legal state created by a declaration of war and ended by official declaration during which the international rules of war apply

Other hyponyms of enmity include latent hostility, tension, state of war, cold war, suspicion.

enmity (noun)	war (noun)
the feeling of a hostile person	the waging of armed conflict against an enemy
a state of deep-seated ill-will	a concerted campaign to end something that is injurious
	an active struggle between competing entities
	a legal state created by a declaration of war and ended by official declaration during which the international rules of war apply

enmity (verb)	war (verb)
	make or wage war