Dibranchia vs subclass Dibranchiata

Dibranchia and subclass Dibranchiata both are nouns.

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

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

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

Other synonyms of Dibranchia include Dibranchiata, subclass Dibranchia.

Dibranchia (noun)	subclass Dibranchiata (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)