sweet violet vs English violet

sweet violet and English violet both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet violet	Yes	No	No	No
English violet	Yes	No	No	No

As nouns, sweet violet and English violet are synonyms defined as:

sweet violet and English violet: European violet typically having purple to white flowers; widely naturalized

Other synonyms of sweet violet include garden violet, Viola odorata.

sweet violet (noun)	English violet (noun)
European violet typically having purple to white flowers; widely naturalized	European violet typically having purple to white flowers; widely naturalized