cinquefoil vs shrub

cinquefoil and shrub both are nouns.

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

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

cinquefoil: any of a numerous plants grown for their five-petaled flowers; abundant in temperate regions; alleged to have medicinal properties
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of cinquefoil include bush.

cinquefoil (noun)	shrub (noun)
an ornamental carving consisting of five arcs arranged in a circle	a low woody perennial plant usually having several major stems
any of a numerous plants grown for their five-petaled flowers; abundant in temperate regions; alleged to have medicinal properties