Mann vs author

Mann and author both are nouns.

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

Mann (noun)	author (noun)
German writer concerned about the role of the artist in bourgeois society (1875-1955)	writes (books or stories or articles or the like) professionally (for pay)
United States educator who introduced reforms that significantly altered the system of public education (1796-1859)	someone who originates or causes or initiates something

Mann (verb)	author (verb)
	be the author of