brown thrush vs Toxostoma rufums

brown thrush and Toxostoma rufums both are nouns.

Word	Noun	Adjective	Verb	Adverb
brown thrush	Yes	No	No	No
Toxostoma rufums	Yes	No	No	No

As nouns, brown thrush and Toxostoma rufums are synonyms defined as:

brown thrush and Toxostoma rufums: common large songbird of eastern United States having reddish-brown plumage

Other synonyms of brown thrush include brown thrasher.

brown thrush (noun)	Toxostoma rufums (noun)
common large songbird of eastern United States having reddish-brown plumage	common large songbird of eastern United States having reddish-brown plumage