public speaker vs rhetorician

public speaker and rhetorician both are nouns.

Word	Noun	Adjective	Verb	Adverb
public speaker	Yes	No	No	No
rhetorician	Yes	No	No	No

As nouns, public speaker and rhetorician are synonyms defined as:

public speaker and rhetorician: a person who delivers a speech or oration

Other synonyms of public speaker include orator, speechifier, speechmaker.

public speaker (noun)	rhetorician (noun)
a person who delivers a speech or oration	a person who delivers a speech or oration