behavior vs activity

behavior and activity both are nouns.

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

As nouns, activity is a hypernym of behavior; that is, activity is a word with a broader meaning than behavior:

As nouns, activity is a hypernym of behavior; that is, activity is a word with a broader meaning than behavior:

behavior: (psychology) the aggregate of the responses or reactions or movements made by an organism in any situation
activity: any specific behavior

As nouns, activity is a hypernym of behavior; that is, activity is a word with a broader meaning than behavior:

behavior: the action or reaction of something (as a machine or substance) under specified circumstances
activity: the state of being active

Other hypernyms of behavior include action, activeness.

behavior (noun)	activity (noun)
manner of acting or controlling yourself	any specific behavior
(psychology) the aggregate of the responses or reactions or movements made by an organism in any situation	the trait of being active; moving or acting rapidly and energetically
(behavioral attributes) the way a person behaves toward other people	an organic process that takes place in the body
the action or reaction of something (as a machine or substance) under specified circumstances	a process existing in or produced by nature (rather than by the intent of human beings)
	the state of being active
	(chemistry) the capacity of a substance to take part in a chemical reaction