genus Hudsonia vs poverty grass

genus Hudsonia and poverty grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Hudsonia	Yes	No	No	No
poverty grass	Yes	No	No	No

genus Hudsonia (noun)	poverty grass (noun)
small evergreen subshrubs of North America	small heathlike plant covered with white down growing on beaches in northeastern North America