flowering quince vs shrub

flowering quince and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
flowering quince	Yes	No	No	No
shrub	Yes	No	No	No

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

flowering quince: Asiatic ornamental shrub with spiny branches and pink or red blossoms
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of flowering quince include bush.

flowering quince (noun)	shrub (noun)
Asiatic ornamental shrub with spiny branches and pink or red blossoms	a low woody perennial plant usually having several major stems