pinkish-orange vs salmon

pinkish-orange is not a noun while salmon is a noun.

Word	Noun	Adjective	Verb	Adverb
pinkish-orange	No	Yes	No	No
salmon	Yes	Yes	No	No

As adjectives, pinkish-orange and salmon are synonyms defined as:

Other synonyms of pinkish-orange include pink-orange.

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

pinkish-orange (adjective)	salmon (adjective)
of orange tinged with pink	of orange tinged with pink