snowbird vs Turdus pilaris

snowbird and Turdus pilaris both are nouns.

Word	Noun	Adjective	Verb	Adverb
snowbird	Yes	No	No	No
Turdus pilaris	Yes	No	No	No

As nouns, snowbird and Turdus pilaris are synonyms defined as:

snowbird and Turdus pilaris: medium-sized Eurasian thrush seen chiefly in winter

Other synonyms of snowbird include fieldfare.

snowbird (noun)	Turdus pilaris (noun)
white Arctic bunting	medium-sized Eurasian thrush seen chiefly in winter
small North American finch seen chiefly in winter
medium-sized Eurasian thrush seen chiefly in winter