imperial mammoth vs imperial elephant

imperial mammoth and imperial elephant both are nouns.

Word	Noun	Adjective	Verb	Adverb
imperial mammoth	Yes	No	No	No
imperial elephant	Yes	No	No	No

As nouns, imperial mammoth and imperial elephant are synonyms defined as:

imperial mammoth and imperial elephant: largest known mammoth; of America

Other synonyms of imperial mammoth include Archidiskidon imperator.

imperial mammoth (noun)	imperial elephant (noun)
largest known mammoth; of America	largest known mammoth; of America