Retama raetam vs shrub

Retama raetam and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Retama raetam	Yes	No	No	No
shrub	Yes	No	No	No

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

Retama raetam: desert shrub of Syria and Arabia having small white flowers; constitutes the juniper of the Old Testament; sometimes placed in genus Genista
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Retama raetam include bush.

Retama raetam (noun)	shrub (noun)
desert shrub of Syria and Arabia having small white flowers; constitutes the juniper of the Old Testament; sometimes placed in genus Genista	a low woody perennial plant usually having several major stems