propulsion vs human action

propulsion and human action both are nouns.

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

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

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

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