Erithacus rubecola vs Old World robin

Erithacus rubecola and Old World robin both are nouns.

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

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

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

Other synonyms of Erithacus rubecola include redbreast, robin, robin redbreast.

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