yodeller vs vocalist

yodeller and vocalist both are nouns.

Word	Noun	Adjective	Verb	Adverb
yodeller	Yes	No	No	No
vocalist	Yes	No	No	No

As nouns, vocalist is a hypernym of yodeller; that is, vocalist is a word with a broader meaning than yodeller:

yodeller: a singer who changes register rapidly (popular in Swiss folk songs)
vocalist: a person who sings

Other hypernyms of yodeller include singer, vocaliser, vocalizer.

yodeller (noun)	vocalist (noun)
a singer who changes register rapidly (popular in Swiss folk songs)	a person who sings