smelt vs American smelt

smelt and American smelt both are nouns.

Word	Noun	Adjective	Verb	Adverb
smelt	Yes	No	Yes	No
American smelt	Yes	No	No	No

As nouns, American smelt is a hyponym of smelt; that is, American smelt is a word with a more specific, narrower meaning than smelt:

Other hyponyms of smelt include rainbow smelt, European smelt, sparling.

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

smelt (verb)	American smelt (verb)
extract (metals) by heating