silverbush vs shrub

silverbush and shrub both are nouns.

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

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

silverbush: silvery hairy European shrub with evergreen foliage and pale yellow flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of silverbush include bush.

silverbush (noun)	shrub (noun)
deciduous unarmed North American shrub with silvery leaves and fruits	a low woody perennial plant usually having several major stems
silvery hairy European shrub with evergreen foliage and pale yellow flowers