aggressiveness vs enmity

aggressiveness and enmity both are nouns.

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

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

Other hypernyms of aggressiveness include hostility, ill will.

aggressiveness (noun)	enmity (noun)
the quality of being bold and enterprising	the feeling of a hostile person
a natural disposition to be hostile	a state of deep-seated ill-will
a feeling of hostility that arouses thoughts of attack