proboscidean vs proboscidian

proboscidean and proboscidian both are nouns.

Word	Noun	Adjective	Verb	Adverb
proboscidean	Yes	No	No	No
proboscidian	Yes	No	No	No

As nouns, proboscidean and proboscidian are synonyms defined as:

proboscidean and proboscidian: massive herbivorous mammals having tusks and a long trunk

proboscidean (noun)	proboscidian (noun)
massive herbivorous mammals having tusks and a long trunk	massive herbivorous mammals having tusks and a long trunk