wych hazel vs witch hazel plant

wych hazel and witch hazel plant both are nouns.

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

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

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

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

wych hazel (noun)	witch hazel plant (noun)
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
any of several shrubs or trees of the genus Hamamelis; bark yields an astringent lotion