behavior vs aggression

behavior and aggression both are nouns.

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

As nouns, aggression is a hyponym of behavior; that is, aggression is a word with a more specific, narrower meaning than behavior:

behavior (noun)	aggression (noun)
manner of acting or controlling yourself	violent action that is hostile and usually unprovoked
(psychology) the aggregate of the responses or reactions or movements made by an organism in any situation	deliberately unfriendly behavior
(behavioral attributes) the way a person behaves toward other people	the act of initiating hostilities
the action or reaction of something (as a machine or substance) under specified circumstances	a disposition to behave aggressively
	a feeling of hostility that arouses thoughts of attack