palm family vs genus Metroxylon

palm family and genus Metroxylon both are nouns.

Word	Noun	Adjective	Verb	Adverb
palm family	Yes	No	No	No
genus Metroxylon	Yes	No	No	No

palm family (noun)	genus Metroxylon (noun)
chiefly tropical trees and shrubs and vines usually having a tall columnar trunk bearing a crown of very large leaves; coextensive with the order Palmales	a genus of Malayan pinnate-leaved palm trees that flower and fruit once and then die