Hexapoda vs class Insecta

Hexapoda and class Insecta both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hexapoda	Yes	No	No	No
class Insecta	Yes	No	No	No

As nouns, Hexapoda and class Insecta are synonyms defined as:

Hexapoda and class Insecta: insects; about five-sixths of all known animal species

Other synonyms of Hexapoda include class Hexapoda, Insecta.

Hexapoda (noun)	class Insecta (noun)
insects; about five-sixths of all known animal species	insects; about five-sixths of all known animal species