Myrtales vs plant order

Myrtales and plant order both are nouns.

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

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

Myrtales: Myrtaceae, Combretaceae, Elaeagnaceae, Haloragidaceae, Melastomaceae, Lecythidaceae, Lythraceae, Rhizophoraceae, Onagraceae, Lecythidaceae, Punicaceae
plant order: the order of plants

Myrtales (noun)	plant order (noun)
Myrtaceae, Combretaceae, Elaeagnaceae, Haloragidaceae, Melastomaceae, Lecythidaceae, Lythraceae, Rhizophoraceae, Onagraceae, Lecythidaceae, Punicaceae	the order of plants