Diapsida vs subclass Diapsida

Diapsida and subclass Diapsida both are nouns.

Word	Noun	Adjective	Verb	Adverb
Diapsida	Yes	No	No	No
subclass Diapsida	Yes	No	No	No

As nouns, Diapsida and subclass Diapsida are synonyms defined as:

Diapsida and subclass Diapsida: used in former classifications to include all living reptiles except turtles; superseded by the two subclasses Lepidosauria and Archosauria

Diapsida (noun)	subclass Diapsida (noun)
used in former classifications to include all living reptiles except turtles; superseded by the two subclasses Lepidosauria and Archosauria	used in former classifications to include all living reptiles except turtles; superseded by the two subclasses Lepidosauria and Archosauria