kinglet vs warbler

kinglet and warbler both are nouns.

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

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

kinglet: small birds resembling warblers but having some of the habits of titmice
warbler: a small active songbird

kinglet (noun)	warbler (noun)
small birds resembling warblers but having some of the habits of titmice	a small active songbird
	a singer; usually a singer who adds embellishments to the song