order Ericales vs plant order

order Ericales and plant order both are nouns.

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

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

order Ericales: Ericaceae, Clethraceae, Diapensiaceae, Epacridaceae, Lennoaceae, Pyrolaceae, Monotropaceae
plant order: the order of plants

order Ericales (noun)	plant order (noun)
Ericaceae, Clethraceae, Diapensiaceae, Epacridaceae, Lennoaceae, Pyrolaceae, Monotropaceae	the order of plants