capsicum pepper plant vs shrub

capsicum pepper plant and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
capsicum pepper plant	Yes	No	No	No
shrub	Yes	No	No	No

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

capsicum pepper plant: any of various tropical plants of the genus Capsicum bearing peppers
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of capsicum pepper plant include bush.

capsicum pepper plant (noun)	shrub (noun)
any of various tropical plants of the genus Capsicum bearing peppers	a low woody perennial plant usually having several major stems