polemicist vs author

polemicist and author both are nouns.

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

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

polemicist: a writer who argues in opposition to others (especially in theology)
author: writes (books or stories or articles or the like) professionally (for pay)

Other hypernyms of polemicist include writer.

polemicist (noun)	author (noun)
a writer who argues in opposition to others (especially in theology)	writes (books or stories or articles or the like) professionally (for pay)
	someone who originates or causes or initiates something

polemicist (verb)	author (verb)
	be the author of