uranologist vs astronomer

uranologist and astronomer both are nouns.

Word	Noun	Adjective	Verb	Adverb
uranologist	Yes	No	No	No
astronomer	Yes	No	No	No

As nouns, uranologist and astronomer are synonyms defined as:

Other synonyms of uranologist include stargazer.

uranologist (noun)	astronomer (noun)
a physicist who studies astronomy	a physicist who studies astronomy