astronomer vs Hall

astronomer and Hall both are nouns.

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

astronomer (noun)	Hall (noun)
a physicist who studies astronomy	United States astronomer who discovered Phobos and Deimos (the two satellites of Mars) (1829-1907)
	United States explorer who led three expeditions to the Arctic (1821-1871)
	United States chemist who developed an economical method of producing aluminum from bauxite (1863-1914)
	United States child psychologist whose theories of child psychology strongly influenced educational psychology (1844-1924)
	English writer whose novel about a lesbian relationship was banned in Britain for many years (1883-1943)