robin redbreast vs Erithacus rubecola

robin redbreast and Erithacus rubecola both are nouns.

Word	Noun	Adjective	Verb	Adverb
robin redbreast	Yes	No	No	No
Erithacus rubecola	Yes	No	No	No

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

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

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

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