aggression vs hostility

aggression and hostility both are nouns.

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

As nouns, aggression and hostility are synonyms defined as:

aggression and hostility: violent action that is hostile and usually unprovoked

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

Other hypernyms of aggression include enmity, ill will.

aggression (noun)	hostility (noun)
violent action that is hostile and usually unprovoked	violent action that is hostile and usually unprovoked
deliberately unfriendly behavior	a hostile (very unfriendly) disposition
the act of initiating hostilities	the feeling of a hostile person
a disposition to behave aggressively	a state of deep-seated ill-will
a feeling of hostility that arouses thoughts of attack