narwhal vs narwhale

narwhal and narwhale both are nouns.

Word	Noun	Adjective	Verb	Adverb
narwhal	Yes	No	No	No
narwhale	Yes	No	No	No

As nouns, narwhal and narwhale are synonyms defined as:

narwhal and narwhale: small Arctic whale the male having a long spiral ivory tusk

Other synonyms of narwhal include Monodon monoceros, narwal.

narwhal (noun)	narwhale (noun)
small Arctic whale the male having a long spiral ivory tusk	small Arctic whale the male having a long spiral ivory tusk