Viminaria juncea vs shrub

Viminaria juncea and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Viminaria juncea	Yes	No	No	No
shrub	Yes	No	No	No

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

Viminaria juncea: Australian leafless shrub resembling broom and having small yellow flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Viminaria juncea include bush.

Viminaria juncea (noun)	shrub (noun)
Australian leafless shrub resembling broom and having small yellow flowers	a low woody perennial plant usually having several major stems