yellowness vs maize

yellowness and maize both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellowness	Yes	No	No	No
maize	Yes	No	No	No

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

yellowness: yellow color or pigment; the chromatic color resembling the hue of sunflowers or ripe lemons
maize: a strong yellow color

yellowness (noun)	maize (noun)
yellow color or pigment; the chromatic color resembling the hue of sunflowers or ripe lemons	a strong yellow color
	tall annual cereal grass bearing kernels on large ears: widely cultivated in America in many varieties; the principal cereal in Mexico and Central and South America since pre-Columbian times