Isoetales vs Isoetaceae

Isoetales and Isoetaceae both are nouns.

Word	Noun	Adjective	Verb	Adverb
Isoetales	Yes	No	No	No
Isoetaceae	Yes	No	No	No

Isoetales (noun)	Isoetaceae (noun)
aquatic or marsh-growing fern allies; known to have existed since the Cenozoic; sometimes included in Lycopodiales	quillworts; coextensive with the genus Isoetes