order Rhoeadales vs plant order

order Rhoeadales and plant order both are nouns.

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

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

order Rhoeadales: an order of dicotyledonous plants, containing the families Capparidaceae, Cruciferae, Moringaceae, Papaveraceae, Resedaceae, and Tovariaceae (Rhoeadales, Papaverales)
plant order: the order of plants

order Rhoeadales (noun)	plant order (noun)
an order of dicotyledonous plants, containing the families Capparidaceae, Cruciferae, Moringaceae, Papaveraceae, Resedaceae, and Tovariaceae (Rhoeadales, Papaverales)	the order of plants