warbler vs vocalizer

warbler and vocalizer both are nouns.

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

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

Other hypernyms of warbler include singer, vocaliser, vocalist.

warbler (noun)	vocalizer (noun)
a small active songbird	a person who sings
a singer; usually a singer who adds embellishments to the song	an organism that can utter vocal sounds