order Malvales vs plant order

order Malvales and plant order both are nouns.

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

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

order Malvales: Malvaceae, Bombacaceae, Elaeocarpaceae, Sterculiaceae, Tiliaceae
plant order: the order of plants

order Malvales (noun)	plant order (noun)
Malvaceae, Bombacaceae, Elaeocarpaceae, Sterculiaceae, Tiliaceae	the order of plants