propulsion vs human activity

propulsion and human activity both are nouns.

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

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

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

propulsion (noun)	human activity (noun)
the act of propelling	something that people do or cause to happen
a propelling force