Cytisus ramentaceus vs shrub

Cytisus ramentaceus and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cytisus ramentaceus	Yes	No	No	No
shrub	Yes	No	No	No

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

Cytisus ramentaceus: erect shrub having large trifoliate leaves and dense clusters of yellow flowers followed by poisonous seeds; Yugoslavia; sometimes placed in genus Cytisus
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Cytisus ramentaceus include bush.

Cytisus ramentaceus (noun)	shrub (noun)
erect shrub having large trifoliate leaves and dense clusters of yellow flowers followed by poisonous seeds; Yugoslavia; sometimes placed in genus Cytisus	a low woody perennial plant usually having several major stems