hostility vs tension

hostility and tension both are nouns.

Word	Noun	Adjective	Verb	Adverb
hostility	Yes	No	No	No
tension	Yes	No	No	No

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

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

hostility (noun)	tension (noun)
violent action that is hostile and usually unprovoked	the action of stretching something tight
a hostile (very unfriendly) disposition	(physics) a stress that produces an elongation of an elastic physical body
the feeling of a hostile person	feelings of hostility that are not manifest
a state of deep-seated ill-will	the physical condition of being stretched or strained
	a balance between and interplay of opposing elements or tendencies (especially in art or literature)
	(psychology) a state of mental or emotional strain or suspense