Spanish lime tree vs genus Melicocca

Spanish lime tree and genus Melicocca both are nouns.

Word	Noun	Adjective	Verb	Adverb
Spanish lime tree	Yes	No	No	No
genus Melicocca	Yes	No	No	No

Spanish lime tree (noun)	genus Melicocca (noun)
tropical American tree bearing a small edible fruit with green leathery skin and sweet juicy translucent pulp	tropical American trees and shrubs bearing berries