potato tree vs shrub

potato tree and shrub both are nouns.

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

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

potato tree: South American shrub or small tree widely cultivated in the tropics; not a true potato
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of potato tree include bush.

potato tree (noun)	shrub (noun)
hardy climbing shrub of Chile grown as an ornamental for its fragrant flowers; not a true potato	a low woody perennial plant usually having several major stems
South American shrub or small tree widely cultivated in the tropics; not a true potato