heath violet vs Viola canina

heath violet and Viola canina both are nouns.

Word	Noun	Adjective	Verb	Adverb
heath violet	Yes	No	No	No
Viola canina	Yes	No	No	No

As nouns, heath violet and Viola canina are synonyms defined as:

heath violet and Viola canina: Old World leafy-stemmed blue-flowered violet

Other synonyms of heath violet include dog violet.

heath violet (noun)	Viola canina (noun)
Old World leafy-stemmed blue-flowered violet	Old World leafy-stemmed blue-flowered violet