dogtooth vs dog's-tooth violet

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

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

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

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

Other synonyms of dogtooth include dogtooth violet.

dogtooth (noun)	dog's-tooth violet (noun)
a carved pyramidal ornament; used in 13th century England	perennial woodland spring-flowering plant; widely cultivated
one of the four pointed conical teeth (two in each jaw) located between the incisors and the premolars
perennial woodland spring-flowering plant; widely cultivated