leaving vs human activity

leaving and human activity both are nouns.

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

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

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

leaving (noun)	human activity (noun)
the act of departing	something that people do or cause to happen