subclass Eutheria vs Proboscidea

subclass Eutheria and Proboscidea both are nouns.

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

subclass Eutheria (noun)	Proboscidea (noun)
all mammals except monotremes and marsupials	an order of animals including elephants and mammoths
	in some classifications included in the genus Martynia and hence the two taxonomic names for some of the unicorn plants