assumption vs human activity

assumption and human activity both are nouns.

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

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

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

assumption (noun)	human activity (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