caplin vs smelt

caplin and smelt both are nouns.

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

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

caplin: very small northern fish; forage for sea birds and marine mammals and other fishes
smelt: small trout-like silvery marine or freshwater food fishes of cold northern waters

caplin (noun)	smelt (noun)
very small northern fish; forage for sea birds and marine mammals and other fishes	small trout-like silvery marine or freshwater food fishes of cold northern waters
	small cold-water silvery fish; migrate between salt and fresh water

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