class Lycopsida vs Isoetales

class Lycopsida and Isoetales both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Lycopsida	Yes	No	No	No
Isoetales	Yes	No	No	No

class Lycopsida (noun)	Isoetales (noun)
club mosses and related forms: includes Lycopodiales, Isoetales, Selaginellales, and extinct Lepidodendrales; sometimes considered a subdivision of Tracheophyta	aquatic or marsh-growing fern allies; known to have existed since the Cenozoic; sometimes included in Lycopodiales