rusty blackbird vs Euphagus carilonus

rusty blackbird and Euphagus carilonus both are nouns.

Word	Noun	Adjective	Verb	Adverb
rusty blackbird	Yes	No	No	No
Euphagus carilonus	Yes	No	No	No

As nouns, rusty blackbird and Euphagus carilonus are synonyms defined as:

rusty blackbird and Euphagus carilonus: North American blackbird whose bluish-black plumage is rusty-edged in the fall

Other synonyms of rusty blackbird include rusty grackle.

rusty blackbird (noun)	Euphagus carilonus (noun)
North American blackbird whose bluish-black plumage is rusty-edged in the fall	North American blackbird whose bluish-black plumage is rusty-edged in the fall