Gaultheria shallon vs shrub

Gaultheria shallon and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gaultheria shallon	Yes	No	No	No
shrub	Yes	No	No	No

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

Gaultheria shallon: small evergreen shrub of Pacific coast of North America having edible dark purple grape-sized berries
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Gaultheria shallon include bush.

Gaultheria shallon (noun)	shrub (noun)
small evergreen shrub of Pacific coast of North America having edible dark purple grape-sized berries	a low woody perennial plant usually having several major stems