arbutus vs shrub

arbutus and shrub both are nouns.

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

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

arbutus: any of several evergreen shrubs of the genus Arbutus of temperate Europe and America
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of arbutus include bush.

arbutus (noun)	shrub (noun)
any of several evergreen shrubs of the genus Arbutus of temperate Europe and America	a low woody perennial plant usually having several major stems