retrieval vs human activity

retrieval and human activity both are nouns.

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

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

retrieval: the act of regaining or saving something lost (or in danger of becoming lost)
human activity: something that people do or cause to happen

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

retrieval (noun)	human activity (noun)
the act of regaining or saving something lost (or in danger of becoming lost)	something that people do or cause to happen
the cognitive operation of accessing information in memory
(computer science) the operation of accessing information from the computer's memory