Japanese andromeda vs shrub

Japanese andromeda and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Japanese andromeda	Yes	No	No	No
shrub	Yes	No	No	No

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

Japanese andromeda: broad-leaved evergreen Asiatic shrub with glossy leaves and drooping clusters of white flowers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Japanese andromeda include bush.

Japanese andromeda (noun)	shrub (noun)
broad-leaved evergreen Asiatic shrub with glossy leaves and drooping clusters of white flowers	a low woody perennial plant usually having several major stems