Holmes vs author

Holmes and author both are nouns.

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

Holmes (noun)	author (noun)
a fictitious detective in stories by A. Conan Doyle	writes (books or stories or articles or the like) professionally (for pay)
English geologist and supporter of the theory of continental drift (1890-1965)	someone who originates or causes or initiates something
United States writer of humorous essays (1809-1894)
United States jurist noted for his liberal opinions (1841-1935)

Holmes (verb)	author (verb)
	be the author of