Icteria virens vs yellow-breasted chat

Icteria virens and yellow-breasted chat both are nouns.

Word	Noun	Adjective	Verb	Adverb
Icteria virens	Yes	No	No	No
yellow-breasted chat	Yes	No	No	No

As nouns, Icteria virens and yellow-breasted chat are synonyms defined as:

Icteria virens and yellow-breasted chat: American warbler noted for imitating songs of other birds

Icteria virens (noun)	yellow-breasted chat (noun)
American warbler noted for imitating songs of other birds	American warbler noted for imitating songs of other birds