Boswell vs author

Boswell and author both are nouns.

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

Boswell (noun)	author (noun)
Scottish author noted for his biography of Samuel Johnson (1740-1795)	writes (books or stories or articles or the like) professionally (for pay)
a devoted admirer and recorder of another's words and deeds	someone who originates or causes or initiates something

Boswell (verb)	author (verb)
	be the author of