wych hazel vs shrub

wych hazel and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
wych hazel	Yes	No	No	No
shrub	Yes	No	No	No

As nouns, shrub is a hypernym of wych hazel; that is, shrub is a word with a broader meaning than wych hazel:

wych hazel: any of several shrubs or trees of the genus Hamamelis; bark yields an astringent lotion
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of wych hazel include bush.

wych hazel (noun)	shrub (noun)
lotion consisting of an astringent alcoholic solution containing an extract from the witch hazel plant	a low woody perennial plant usually having several major stems
any of several shrubs or trees of the genus Hamamelis; bark yields an astringent lotion