uranology vs selenology

uranology and selenology both are nouns.

Word	Noun	Adjective	Verb	Adverb
uranology	Yes	No	No	No
selenology	Yes	No	No	No

As nouns, selenology is a hyponym of uranology; that is, selenology is a word with a more specific, narrower meaning than uranology:

uranology: the branch of physics that studies celestial bodies and the universe as a whole
selenology: the branch of astronomy that deals with the moon

uranology (noun)	selenology (noun)
the branch of physics that studies celestial bodies and the universe as a whole	the branch of astronomy that deals with the moon