subclass Eutheria vs Eutheria

subclass Eutheria and Eutheria both are nouns.

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

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

subclass Eutheria and Eutheria: all mammals except monotremes and marsupials

subclass Eutheria (noun)	Eutheria (noun)
all mammals except monotremes and marsupials	all mammals except monotremes and marsupials