subclass Elasmobranchii vs Selachii

subclass Elasmobranchii and Selachii both are nouns.

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

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

Other synonyms of subclass Elasmobranchii include Elasmobranchii, subclass Selachii.

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