Old World robin vs Erithacus rubecola

Old World robin and Erithacus rubecola both are nouns.

Word	Noun	Adjective	Verb	Adverb
Old World robin	Yes	No	No	No
Erithacus rubecola	Yes	No	No	No

As nouns, Old World robin and Erithacus rubecola are synonyms defined as:

Old World robin and Erithacus rubecola: small Old World songbird with a reddish breast

Other synonyms of Old World robin include redbreast, robin, robin redbreast.

Old World robin (noun)	Erithacus rubecola (noun)
small Old World songbird with a reddish breast	small Old World songbird with a reddish breast