Osmerus mordax vs smelt

Osmerus mordax and smelt both are nouns.

Word	Noun	Adjective	Verb	Adverb
Osmerus mordax	Yes	No	No	No
smelt	Yes	No	Yes	No

As nouns, smelt is a hypernym of Osmerus mordax; that is, smelt is a word with a broader meaning than Osmerus mordax:

Osmerus mordax: important marine and landlocked food fish of eastern North America and Alaska
smelt: small trout-like silvery marine or freshwater food fishes of cold northern waters

Osmerus mordax (noun)	smelt (noun)
important marine and landlocked food fish of eastern North America and Alaska	small trout-like silvery marine or freshwater food fishes of cold northern waters
	small cold-water silvery fish; migrate between salt and fresh water

Osmerus mordax (verb)	smelt (verb)
	extract (metals) by heating