greater whitethroat vs Sylvia communis

greater whitethroat and Sylvia communis both are nouns.

Word	Noun	Adjective	Verb	Adverb
greater whitethroat	Yes	No	No	No
Sylvia communis	Yes	No	No	No

As nouns, greater whitethroat and Sylvia communis are synonyms defined as:

greater whitethroat and Sylvia communis: greyish-brown Old World warbler with a white throat and underparts

Other synonyms of greater whitethroat include whitethroat.

greater whitethroat (noun)	Sylvia communis (noun)
greyish-brown Old World warbler with a white throat and underparts	greyish-brown Old World warbler with a white throat and underparts