order Pulmonata vs class Gasteropoda

order Pulmonata and class Gasteropoda both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Pulmonata	Yes	No	No	No
class Gasteropoda	Yes	No	No	No

order Pulmonata (noun)	class Gasteropoda (noun)
large order of gastropods usually breathing by means of a lung-like sac comprising most land snails and slugs and many freshwater snails	snails and slugs and their relatives