order Gnetales vs plant order

order Gnetales and plant order both are nouns.

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

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

order Gnetales: chiefly tropical or xerophytic woody plants; practically unknown as fossils but considered close to the ancestral line of angiosperms
plant order: the order of plants

order Gnetales (noun)	plant order (noun)
chiefly tropical or xerophytic woody plants; practically unknown as fossils but considered close to the ancestral line of angiosperms	the order of plants