order Opuntiales vs plant order

order Opuntiales and plant order both are nouns.

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

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

order Opuntiales (noun)	plant order (noun)
coextensive with the family Cactaceae: cactuses	the order of plants