king salmon vs king salmon

king salmon and king salmon both are nouns.

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

king salmon (noun)	king salmon (noun)
large Pacific salmon valued as food; adults die after spawning	large Pacific salmon valued as food; adults die after spawning
pink or white flesh of large Pacific salmon	pink or white flesh of large Pacific salmon