wych hazel plant vs shrub

wych hazel plant and shrub both are nouns.

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

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

wych hazel plant: 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 plant include bush.

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