order Charadriiformes vs class Aves

order Charadriiformes and class Aves both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Charadriiformes	Yes	No	No	No
class Aves	Yes	No	No	No

order Charadriiformes (noun)	class Aves (noun)
large diverse order of aquatic birds found along seacoasts and inland waters: shorebirds and coastal diving birds; most feed on animal life	(ornithology) the class of birds