crepe gardenia vs shrub

crepe gardenia and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
crepe gardenia	Yes	No	No	No
shrub	Yes	No	No	No

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

crepe gardenia: tropical shrub having glossy foliage and fragrant nocturnal flowers with crimped or wavy corollas; northern India to Thailand
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of crepe gardenia include bush.

crepe gardenia (noun)	shrub (noun)
tropical shrub having glossy foliage and fragrant nocturnal flowers with crimped or wavy corollas; northern India to Thailand	a low woody perennial plant usually having several major stems