genus Kirkia vs pepper tree

genus Kirkia and pepper tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Kirkia	Yes	No	No	No
pepper tree	Yes	No	No	No

genus Kirkia (noun)	pepper tree (noun)
small genus of tropical South African trees and shrubs	small African deciduous tree with spreading crown having leaves clustered toward ends of branches and clusters of creamy flowers resembling lilacs
	small Peruvian evergreen with broad rounded head and slender pendant branches with attractive clusters of greenish flowers followed by clusters of rose-pink fruits