genus Erythrina vs coral tree

genus Erythrina and coral tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Erythrina	Yes	No	No	No
coral tree	Yes	No	No	No

genus Erythrina (noun)	coral tree (noun)
genus of attractive tropical shrubs or trees with usually red flowers	any of various shrubs or shrubby trees of the genus Erythrina having trifoliate leaves and racemes of scarlet to coral red flowers and black seeds; cultivated as an ornamental