public speaker vs orator

public speaker and orator both are nouns.

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

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

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

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