Dibranchiata vs subclass Dibranchia

Dibranchiata and subclass Dibranchia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Dibranchiata	Yes	No	No	No
subclass Dibranchia	Yes	No	No	No

As nouns, Dibranchiata and subclass Dibranchia are synonyms defined as:

Dibranchiata and subclass Dibranchia: comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish)

Other synonyms of Dibranchiata include Dibranchia, subclass Dibranchiata.

Dibranchiata (noun)	subclass Dibranchia (noun)
comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish)	comprising all living cephalopods except the family Nautilidae: the orders Octopoda (octopuses) and Decapoda (squids and cuttlefish)