aggressive vs aggressiveness

aggressive is not a noun while aggressiveness is a noun.

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

aggressive (noun)	aggressiveness (noun)
	the quality of being bold and enterprising
	a natural disposition to be hostile
	a feeling of hostility that arouses thoughts of attack

aggressive (adjective)	aggressiveness (adjective)
having or showing determination and energetic pursuit of your ends
characteristic of an enemy or one eager to fight
tending to spread quickly