order Pseudoscorpionida vs class Arachnida

order Pseudoscorpionida and class Arachnida both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Pseudoscorpionida	Yes	No	No	No
class Arachnida	Yes	No	No	No

order Pseudoscorpionida (noun)	class Arachnida (noun)
false scorpions	a large class of arthropods including spiders and ticks and scorpions and daddy longlegs; have four pairs of walking legs and no wings