Cordaitales vs Cordaitaceae

Cordaitales and Cordaitaceae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cordaitales	Yes	No	No	No
Cordaitaceae	Yes	No	No	No

Cordaitales (noun)	Cordaitaceae (noun)
extinct plants having tall arborescent trunks comparable to or more advanced than cycads; known from the Pennsylvanian period; probably extinct since the Mesozoic era	chiefly Paleozoic plants; Cordaites is the chief and typical genus