styrax vs shrub

styrax and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
styrax	Yes	No	No	No
shrub	Yes	No	No	No

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

styrax: any shrub or small tree of the genus Styrax having fragrant bell-shaped flowers that hang below the dark green foliage
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of styrax include bush.

styrax (noun)	shrub (noun)
any shrub or small tree of the genus Styrax having fragrant bell-shaped flowers that hang below the dark green foliage	a low woody perennial plant usually having several major stems