witch hazel plant vs witch hazel

witch hazel plant and witch hazel both are nouns.

Word	Noun	Adjective	Verb	Adverb
witch hazel plant	Yes	No	No	No
witch hazel	Yes	No	No	No

As nouns, witch hazel plant and witch hazel are synonyms defined as:

witch hazel plant and witch hazel: any of several shrubs or trees of the genus Hamamelis; bark yields an astringent lotion

Other synonyms of witch hazel plant include wych hazel, wych hazel plant.

witch hazel plant (noun)	witch hazel (noun)
any of several shrubs or trees of the genus Hamamelis; bark yields an astringent lotion	lotion consisting of an astringent alcoholic solution containing an extract from the witch hazel plant
	any of several shrubs or trees of the genus Hamamelis; bark yields an astringent lotion