phoebe bird vs Sayornis phoebe

phoebe bird and Sayornis phoebe both are nouns.

Word	Noun	Adjective	Verb	Adverb
phoebe bird	Yes	No	No	No
Sayornis phoebe	Yes	No	No	No

As nouns, phoebe bird and Sayornis phoebe are synonyms defined as:

phoebe bird and Sayornis phoebe: small dun-colored North American flycatcher

Other synonyms of phoebe bird include phoebe.

phoebe bird (noun)	Sayornis phoebe (noun)
small dun-colored North American flycatcher	small dun-colored North American flycatcher