whiteness vs ivory

whiteness and ivory both are nouns.

Word	Noun	Adjective	Verb	Adverb
whiteness	Yes	No	No	No
ivory	Yes	No	No	No

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

whiteness: the quality or state of the achromatic color of greatest lightness (bearing the least resemblance to black)
ivory: a shade of white the color of bleached bones

Other hyponyms of whiteness include alabaster, bleach, bone, off-white, pearl, chalk, frostiness, hoariness.

whiteness (noun)	ivory (noun)
the quality or state of the achromatic color of greatest lightness (bearing the least resemblance to black)	a shade of white the color of bleached bones
lightness or fairness of complexion	a hard smooth ivory colored dentine that makes up most of the tusks of elephants and walruses
the state of being unsullied by sin or moral wrong; lacking a knowledge of evil