vocalizer vs utterer

vocalizer and utterer both are nouns.

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

As nouns, vocalizer and utterer are synonyms defined as:

Other synonyms of vocalizer include vocaliser.

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