You are having a hard time reading. Mexican is the subject. Whitest is an adjective. Richest blue. Darkest night. Dumbest mod. None of these change the subject they describe it. Blue is still blue, night is still night, Let me help adjective noun ad·​jec·​tive ˈa-jik-tiv also ˈa-jə-tiv : a word belonging to one of the major form classes in any of numerous languages and typically serving as a modifier of a noun to denote a quality of the thing named, to indicate its quantity or extent, or to specify a thing as distinct from something else The word red in "the red car" is an adjective