utterer vs vocalizer

utterer and vocalizer both are nouns.

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

As nouns, utterer and vocalizer are synonyms defined as:

Other synonyms of utterer include vocaliser.

utterer (noun)	vocalizer (noun)
someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)	a person who sings
someone who circulates forged banknotes or counterfeit coins	an organism that can utter vocal sounds
an organism that can utter vocal sounds