subclass Elasmobranchii vs subclass Selachii

subclass Elasmobranchii and subclass Selachii both are nouns.

Word	Noun	Adjective	Verb	Adverb
subclass Elasmobranchii	Yes	No	No	No
subclass Selachii	Yes	No	No	No

As nouns, subclass Elasmobranchii and subclass Selachii are synonyms defined as:

subclass Elasmobranchii and subclass Selachii: sharks, rays, dogfishes, skates

Other synonyms of subclass Elasmobranchii include Elasmobranchii, Selachii.

subclass Elasmobranchii (noun)	subclass Selachii (noun)
sharks, rays, dogfishes, skates	sharks, rays, dogfishes, skates