articulator vs talker

articulator and talker both are nouns.

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

As nouns, talker is a hyponym of articulator; that is, talker is a word with a more specific, narrower meaning than articulator:

articulator: someone who pronounces words
talker: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

Other hyponyms of articulator include speaker, utterer, verbaliser, verbalizer, subvocaliser, subvocalizer.

articulator (noun)	talker (noun)
a movable speech organ	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)
someone who pronounces words