author vs Post

author and Post both are nouns.

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

author (noun)	Post (noun)
writes (books or stories or articles or the like) professionally (for pay)	United States manufacturer of breakfast cereals and Postum (1854-1914)
someone who originates or causes or initiates something	United States female author who wrote a book and a syndicated newspaper column on etiquette (1872-1960)
	United States aviator who in 1933 made the first solo flight around the world (1899-1935)

author (verb)	Post (verb)
be the author of