Hirudinea vs class Hirudinea

Hirudinea and class Hirudinea both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hirudinea	Yes	No	No	No
class Hirudinea	Yes	No	No	No

As nouns, Hirudinea and class Hirudinea are synonyms defined as:

Hirudinea and class Hirudinea: hermaphroditic aquatic or terrestrial or parasitic annelids

Hirudinea (noun)	class Hirudinea (noun)
hermaphroditic aquatic or terrestrial or parasitic annelids	hermaphroditic aquatic or terrestrial or parasitic annelids