articulator vs utterer

articulator and utterer both are nouns.

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

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

articulator: someone who pronounces words
utterer: 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, talker, verbaliser, verbalizer, subvocaliser, subvocalizer.

articulator (noun)	utterer (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	someone who circulates forged banknotes or counterfeit coins
	an organism that can utter vocal sounds