genus Plagianthus vs ribbon tree

genus Plagianthus and ribbon tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Plagianthus	Yes	No	No	No
ribbon tree	Yes	No	No	No

genus Plagianthus (noun)	ribbon tree (noun)
small genus of shrubs and trees of Australia and New Zealand	deciduous New Zealand tree whose inner bark yields a strong fiber that resembles flax and is called New Zealand cotton