order Sphagnales vs plant order

order Sphagnales and plant order both are nouns.

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

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

order Sphagnales: coextensive with the genus Sphagnum; in some classifications isolated in a separate subclass
plant order: the order of plants

order Sphagnales (noun)	plant order (noun)
coextensive with the genus Sphagnum; in some classifications isolated in a separate subclass	the order of plants