order Palmales vs plant order

order Palmales and plant order both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Palmales	Yes	No	No	No
plant order	Yes	No	No	No

As nouns, plant order is a hypernym of order Palmales; that is, plant order is a word with a broader meaning than order Palmales:

order Palmales (noun)	plant order (noun)
coextensive with the family Palmae: palms	the order of plants