salmon vs salmonid

salmon and salmonid both are nouns.

Word	Noun	Adjective	Verb	Adverb
salmon	Yes	Yes	No	No
salmonid	Yes	No	No	No

As nouns, salmonid is a hypernym of salmon; that is, salmonid is a word with a broader meaning than salmon:

salmon: any of various large food and game fishes of northern waters; usually migrate from salt to fresh water to spawn
salmonid: soft-finned fishes of cold and temperate waters

Other hypernyms of salmon include food fish.

salmon (noun)	salmonid (noun)
any of various large food and game fishes of northern waters; usually migrate from salt to fresh water to spawn	soft-finned fishes of cold and temperate waters
a pale pinkish orange color
flesh of any of various marine or freshwater fish of the family Salmonidae

salmon (adjective)	salmonid (adjective)
of orange tinged with pink