warbler vs vocalist

warbler and vocalist both are nouns.

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

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

Other hypernyms of warbler include singer, vocaliser, vocalizer.

warbler (noun)	vocalist (noun)
a small active songbird	a person who sings
a singer; usually a singer who adds embellishments to the song