retem vs shrub

retem and shrub both are nouns.

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

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

retem: 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 retem include bush.

retem (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