activity vs human activity

activity and human activity both are nouns.

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

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

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

activity (noun)	human activity (noun)
any specific behavior	something that people do or cause to happen
the trait of being active; moving or acting rapidly and energetically
an organic process that takes place in the body
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