class Onychophora vs Arthropoda

class Onychophora and Arthropoda both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Onychophora	Yes	No	No	No
Arthropoda	Yes	No	No	No

class Onychophora (noun)	Arthropoda (noun)
enigmatic small elongated wormlike terrestrial invertebrates of damp dark habitats in warm regions; distinct from the phylum Annelida; resemble slugs with legs and are sometimes described as the missing link between arthropods and annelids	jointed-foot invertebrates: arachnids, crustaceans, insects, millipedes, centipedes