warbler vs warble

warbler and warble both are nouns.

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

warbler (noun)	warble (noun)
a small active songbird	a lumpy abscess under the hide of domestic mammals caused by larvae of a botfly or warble fly
a singer; usually a singer who adds embellishments to the song

warbler (verb)	warble (verb)
	sing or play with trills, alternating with the half note above or below
	sing by changing register; sing by yodeling