Articulator and Utterer

Articulator noun - A movable speech organ.

Utterer and articulator are semantically related. In some cases you can replace term "Utterer" with "Articulator", this nouns are similar.

Utterer noun - Someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous).

Articulator and utterer are semantically related. Sometimes you can use "Articulator" instead a noun "Utterer".