leaning vs human activity

leaning and human activity both are nouns.

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

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

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

leaning (noun)	human activity (noun)
the act of deviating from a vertical position	something that people do or cause to happen
the property possessed by a line or surface that departs from the vertical
a natural inclination
an inclination to do something

leaning (adjective)	human activity (adjective)
departing or being caused to depart from the true vertical or horizontal