order Psilotales vs class Psilotatae

order Psilotales and class Psilotatae both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Psilotales	Yes	No	No	No
class Psilotatae	Yes	No	No	No

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