caroller vs singer

caroller and singer both are nouns.

Word	Noun	Adjective	Verb	Adverb
caroller	Yes	No	No	No
singer	Yes	No	No	No

As nouns, singer is a hypernym of caroller; that is, singer is a word with a broader meaning than caroller:

Other hypernyms of caroller include vocaliser, vocalist, vocalizer.

caroller (noun)	singer (noun)
a singer of carols	a person who sings