narwal vs Monodon monoceros

narwal and Monodon monoceros both are nouns.

Word	Noun	Adjective	Verb	Adverb
narwal	Yes	No	No	No
Monodon monoceros	Yes	No	No	No

As nouns, narwal and Monodon monoceros are synonyms defined as:

narwal and Monodon monoceros: small Arctic whale the male having a long spiral ivory tusk

Other synonyms of narwal include narwhal, narwhale.

narwal (noun)	Monodon monoceros (noun)
small Arctic whale the male having a long spiral ivory tusk	small Arctic whale the male having a long spiral ivory tusk