yellow-breasted chat vs Icteria virens

yellow-breasted chat and Icteria virens both are nouns.

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

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

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

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