caroler vs vocaliser

caroler and vocaliser both are nouns.

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

As nouns, vocaliser is a hypernym of caroler; that is, vocaliser is a word with a broader meaning than caroler:

Other hypernyms of caroler include singer, vocalist, vocalizer.

caroler (noun)	vocaliser (noun)
a singer of carols	a person who sings
	an organism that can utter vocal sounds