author vs write

author is a noun but write is not a noun.

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

As verbs, write is a hypernym of author; that is, write is a word with a broader meaning than author:

Other hypernyms of author include compose, indite, pen.

author (noun)	write (noun)
writes (books or stories or articles or the like) professionally (for pay)
someone who originates or causes or initiates something

author (verb)	write (verb)
be the author of	communicate or express by writing
	record data on a computer
	contact in writing
	produce a literary work
	mark or trace words or symbols on a surface
	write or name the letters that comprise the conventionally accepted form of (a word or part of a word)
	write music
	create code, write a computer program