subclass Infusoria vs class Ciliophora

subclass Infusoria and class Ciliophora both are nouns.

Word	Noun	Adjective	Verb	Adverb
subclass Infusoria	Yes	No	No	No
class Ciliophora	Yes	No	No	No

subclass Infusoria (noun)	class Ciliophora (noun)
in some recent classifications, coextensive with the Ciliata: minute organisms found in decomposing infusions of organic matter	class of protozoa having cilia or hairlike appendages on part or all of the surface during some part of the life cycle