spindle tree vs shrub

spindle tree and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
spindle tree	Yes	No	No	No
shrub	Yes	No	No	No

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

spindle tree: any shrubby trees or woody vines of the genus Euonymus having showy usually reddish berries
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of spindle tree include bush.

spindle tree (noun)	shrub (noun)
any shrubby trees or woody vines of the genus Euonymus having showy usually reddish berries	a low woody perennial plant usually having several major stems