class Aves vs order Charadriiformes

class Aves and order Charadriiformes both are nouns.

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

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