author vs Hall

author and Hall both are nouns.

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

author (noun)	Hall (noun)
writes (books or stories or articles or the like) professionally (for pay)	United States astronomer who discovered Phobos and Deimos (the two satellites of Mars) (1829-1907)
someone who originates or causes or initiates something	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)

author (verb)	Hall (verb)
be the author of