class Lycopsida vs order Lepidodendrales

class Lycopsida and order Lepidodendrales both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Lycopsida	Yes	No	No	No
order Lepidodendrales	Yes	No	No	No

class Lycopsida (noun)	order Lepidodendrales (noun)
club mosses and related forms: includes Lycopodiales, Isoetales, Selaginellales, and extinct Lepidodendrales; sometimes considered a subdivision of Tracheophyta	fossil arborescent plants arising during the early Devonian and conspicuous throughout the Carboniferous