order Santalales vs plant order

order Santalales and plant order both are nouns.

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

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

order Santalales: order of plants distinguished by having a one-celled inferior ovary; many are parasitic or partly parasitic usually on roots
plant order: the order of plants

order Santalales (noun)	plant order (noun)
order of plants distinguished by having a one-celled inferior ovary; many are parasitic or partly parasitic usually on roots	the order of plants