orator vs talker

orator and talker both are nouns.

Word	Noun	Adjective	Verb	Adverb
orator	Yes	No	No	No
talker	Yes	No	No	No

As nouns, talker is a hypernym of orator; that is, talker is a word with a broader meaning than orator:

orator: a person who delivers a speech or oration
talker: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

Other hypernyms of orator include speaker, utterer, verbaliser, verbalizer.

orator (noun)	talker (noun)
a person who delivers a speech or oration	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)