is a specific kind of: communicator.

is a broader term that covers: speaker, talker, utterer, verbaliser, verbalizer | subvocaliser, subvocalizer.

derivation: articulate, enounce, enunciate, pronounce, say, sound out.

is a specific kind of: organ of speech, speech organ, vocal organ.

is a broader term that covers: jawbone, jowl, lower jaw, lower jawbone, mandible, mandibula, mandibular bone, submaxilla | clapper, glossa, lingua, tongue | lip.