assumption vs human action

assumption and human action both are nouns.

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

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

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

assumption (noun)	human action (noun)
the act of taking possession of or power over something	something that people do or cause to happen
the act of assuming or taking for granted
audacious (even arrogant) behavior that you have no right to
a hypothesis that is taken for granted
a statement that is assumed to be true and from which a conclusion can be drawn