order Psilotales vs plant order

order Psilotales and plant order both are nouns.

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

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

order Psilotales: lower vascular plants having dichotomously branched sporophyte divided into aerial shoot and rhizome and lacking true roots
plant order: the order of plants

order Psilotales (noun)	plant order (noun)
lower vascular plants having dichotomously branched sporophyte divided into aerial shoot and rhizome and lacking true roots	the order of plants