vocalizer vs vocaliser

vocalizer and vocaliser both are nouns.

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

As nouns, vocalizer and vocaliser are synonyms defined as:

Other synonyms of vocalizer include singer, vocalist.

As nouns, vocalizer and vocaliser are synonyms defined as:

Other synonyms of vocalizer include utterer.

vocalizer (noun)	vocaliser (noun)
a person who sings	a person who sings
an organism that can utter vocal sounds	an organism that can utter vocal sounds