folk singer vs vocaliser

folk singer and vocaliser both are nouns.

Word	Noun	Adjective	Verb	Adverb
folk singer	Yes	No	No	No
vocaliser	Yes	No	No	No

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

Other hypernyms of folk singer include singer, vocalist, vocalizer.

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