mallow vs shrub

mallow and shrub both are nouns.

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

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

Other hypernyms of mallow include bush.

mallow (noun)	shrub (noun)
any of various plants of the family Malvaceae	a low woody perennial plant usually having several major stems