order Taxales vs plant order

order Taxales and plant order both are nouns.

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

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

order Taxales (noun)	plant order (noun)
coextensive with the family Taxaceae: yews	the order of plants