going away vs human action

going away and human action both are nouns.

Word	Noun	Adjective	Verb	Adverb
going away	Yes	No	No	No
human action	Yes	No	No	No

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

Other hypernyms of going away include act, deed, human activity.

going away (noun)	human action (noun)
the act of departing	something that people do or cause to happen