salmon vs red salmon

salmon and red salmon both are nouns.

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

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

salmon: any of various large food and game fishes of northern waters; usually migrate from salt to fresh water to spawn
red salmon: small salmon with red flesh; found in rivers and tributaries of the northern Pacific and valued as food; adults die after spawning

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

salmon: flesh of any of various marine or freshwater fish of the family Salmonidae
red salmon: fatty red flesh of salmon of Pacific coast and rivers

salmon (noun)	red salmon (noun)
any of various large food and game fishes of northern waters; usually migrate from salt to fresh water to spawn	small salmon with red flesh; found in rivers and tributaries of the northern Pacific and valued as food; adults die after spawning
a pale pinkish orange color	fatty red flesh of salmon of Pacific coast and rivers
flesh of any of various marine or freshwater fish of the family Salmonidae

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