aggressiveness vs aggression

aggressiveness and aggression both are nouns.

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

As nouns, aggressiveness and aggression are synonyms defined as:

aggressiveness and aggression: a feeling of hostility that arouses thoughts of attack

aggressiveness (noun)	aggression (noun)
the quality of being bold and enterprising	violent action that is hostile and usually unprovoked
a natural disposition to be hostile	deliberately unfriendly behavior
a feeling of hostility that arouses thoughts of attack	the act of initiating hostilities
	a disposition to behave aggressively
	a feeling of hostility that arouses thoughts of attack