dog's-tooth violet vs dogtooth violet

dog's-tooth violet and dogtooth violet both are nouns.

Word	Noun	Adjective	Verb	Adverb
dog's-tooth violet	Yes	No	No	No
dogtooth violet	Yes	No	No	No

As nouns, dog's-tooth violet and dogtooth violet are synonyms defined as:

dog's-tooth violet and dogtooth violet: perennial woodland spring-flowering plant; widely cultivated

Other synonyms of dog's-tooth violet include dogtooth.

dog's-tooth violet (noun)	dogtooth violet (noun)
perennial woodland spring-flowering plant; widely cultivated	perennial woodland spring-flowering plant; widely cultivated