kei apple bush vs shrub

kei apple bush and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
kei apple bush	Yes	No	No	No
shrub	Yes	No	No	No

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

kei apple bush: vigorous South African spiny shrub grown for its round yellow juicy edible fruits
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of kei apple bush include bush.

kei apple bush (noun)	shrub (noun)
vigorous South African spiny shrub grown for its round yellow juicy edible fruits	a low woody perennial plant usually having several major stems