cosmology vs astrophysics

cosmology and astrophysics both are nouns.

Word	Noun	Adjective	Verb	Adverb
cosmology	Yes	No	No	No
astrophysics	Yes	No	No	No

As nouns, astrophysics is a hypernym of cosmology; that is, astrophysics is a word with a broader meaning than cosmology:

cosmology: the branch of astrophysics that studies the origin and evolution and structure of the universe
astrophysics: the branch of astronomy concerned with the physical and chemical properties of celestial bodies

cosmology (noun)	astrophysics (noun)
the branch of astrophysics that studies the origin and evolution and structure of the universe	the branch of astronomy concerned with the physical and chemical properties of celestial bodies
the metaphysical study of the origin and nature of the universe