solar physics vs astronomy

solar physics and astronomy both are nouns.

Word	Noun	Adjective	Verb	Adverb
solar physics	Yes	No	No	No
astronomy	Yes	No	No	No

As nouns, astronomy is a hypernym of solar physics; that is, astronomy is a word with a broader meaning than solar physics:

solar physics: the branch of astronomy that deals with the sun
astronomy: the branch of physics that studies celestial bodies and the universe as a whole

Other hypernyms of solar physics include uranology.

solar physics (noun)	astronomy (noun)
the branch of astronomy that deals with the sun	the branch of physics that studies celestial bodies and the universe as a whole