alliterator vs author

alliterator and author both are nouns.

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

As nouns, author is a hypernym of alliterator; that is, author is a word with a broader meaning than alliterator:

alliterator: a speaker or writer who makes use of alliteration
author: writes (books or stories or articles or the like) professionally (for pay)

Other hypernyms of alliterator include speaker, talker, utterer, verbaliser, verbalizer, writer.

alliterator (noun)	author (noun)
a speaker or writer who makes use of alliteration	writes (books or stories or articles or the like) professionally (for pay)
	someone who originates or causes or initiates something

alliterator (verb)	author (verb)
	be the author of