subclass Anapsida vs class Reptilia

subclass Anapsida and class Reptilia both are nouns.

Word	Noun	Adjective	Verb	Adverb
subclass Anapsida	Yes	No	No	No
class Reptilia	Yes	No	No	No

subclass Anapsida (noun)	class Reptilia (noun)
oldest known reptiles; turtles and extinct Permian forms	class of cold-blooded air-breathing vertebrates with completely ossified skeleton and a body usually covered with scales or horny plates; once the dominant land animals