Dipnoi vs subclass Dipnoi

Dipnoi and subclass Dipnoi both are nouns.

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

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

Dipnoi and subclass Dipnoi: bony fishes of the Southern Hemisphere that breathe by a modified air bladder as well as gills; sometimes classified as an order of Crossopterygii

Dipnoi (noun)	subclass Dipnoi (noun)
bony fishes of the Southern Hemisphere that breathe by a modified air bladder as well as gills; sometimes classified as an order of Crossopterygii	bony fishes of the Southern Hemisphere that breathe by a modified air bladder as well as gills; sometimes classified as an order of Crossopterygii