robin redbreast vs redbreast

robin redbreast and redbreast both are nouns.

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

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

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

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

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