mountain devil vs shrub

mountain devil and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain devil	Yes	No	No	No
shrub	Yes	No	No	No

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

mountain devil: erect bushy shrub of eastern Australia having terminal clusters of red flowers yielding much nectar
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of mountain devil include bush.

mountain devil (noun)	shrub (noun)
desert lizard that feeds on ants	a low woody perennial plant usually having several major stems
erect bushy shrub of eastern Australia having terminal clusters of red flowers yielding much nectar