Cordaitaceae vs Cordaitales

Cordaitaceae and Cordaitales both are nouns.

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

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