tree mallow vs shrub

tree mallow and shrub both are nouns.

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

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

tree mallow: arborescent perennial shrub having palmately lobed furry leaves and showy red-purple flowers; southwestern United States
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of tree mallow include bush.

tree mallow (noun)	shrub (noun)
arborescent perennial shrub having palmately lobed furry leaves and showy red-purple flowers; southwestern United States	a low woody perennial plant usually having several major stems