class Psilopsida vs Psilotales

class Psilopsida and Psilotales both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Psilopsida	Yes	No	No	No
Psilotales	Yes	No	No	No

class Psilopsida (noun)	Psilotales (noun)
whisk ferns; comprising the family Psilotaceae or Psilotatae: vascular plants with no roots, partial if any leaf differentiation, and rudimentary spore sacs	lower vascular plants having dichotomously branched sporophyte divided into aerial shoot and rhizome and lacking true roots