articulator vs speaker

articulator and speaker both are nouns.

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

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

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

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

articulator (noun)	speaker (noun)
a movable speech organ	electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
someone who pronounces words	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)