departure vs human activity

departure and human activity both are nouns.

Word	Noun	Adjective	Verb	Adverb
departure	Yes	No	No	No
human activity	Yes	No	No	No

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

Other hypernyms of departure include act, deed, human action.

departure (noun)	human activity (noun)
the act of departing	something that people do or cause to happen
euphemistic expressions for death
a variation that deviates from the standard or norm