aggressiveness vs hostility

aggressiveness and hostility both are nouns.

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

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

Other hypernyms of aggressiveness include enmity, ill will.

aggressiveness (noun)	hostility (noun)
the quality of being bold and enterprising	violent action that is hostile and usually unprovoked
a natural disposition to be hostile	a hostile (very unfriendly) disposition
a feeling of hostility that arouses thoughts of attack	the feeling of a hostile person
	a state of deep-seated ill-will