palm tree vs family Palmae

palm tree and family Palmae both are nouns.

Word	Noun	Adjective	Verb	Adverb
palm tree	Yes	No	No	No
family Palmae	Yes	No	No	No

palm tree (noun)	family Palmae (noun)
any plant of the family Palmae having an unbranched trunk crowned by large pinnate or palmate leaves	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