hostility vs unfriendliness

hostility and unfriendliness both are nouns.

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

As nouns, unfriendliness is a hypernym of hostility; that is, unfriendliness is a word with a broader meaning than hostility:

hostility (noun)	unfriendliness (noun)
violent action that is hostile and usually unprovoked	an unfriendly disposition
a hostile (very unfriendly) disposition	dislike experienced as an absence of friendliness
the feeling of a hostile person
a state of deep-seated ill-will