chat vs New World warbler

chat and New World warbler both are nouns.

Word	Noun	Adjective	Verb	Adverb
chat	Yes	No	Yes	No
New World warbler	Yes	No	No	No

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

chat: birds having a chattering call
New World warbler: small bright-colored American songbird with a weak unmusical song

Other hypernyms of chat include wood warbler.

chat (noun)	New World warbler (noun)
songbirds having a chattering call	small bright-colored American songbird with a weak unmusical song
birds having a chattering call
an informal conversation

chat (verb)	New World warbler (verb)
talk socially without exchanging too much information