class Aves vs Ciconiiformes

class Aves and Ciconiiformes both are nouns.

Word	Noun	Adjective	Verb	Adverb
class Aves	Yes	No	No	No
Ciconiiformes	Yes	No	No	No

class Aves (noun)	Ciconiiformes (noun)
(ornithology) the class of birds	order of chiefly tropical marsh-dwelling fish-eating wading birds with long legs and bills and (except for flamingos) unwebbed feet: herons, storks, spoonbills, flamingos, ibises