whiteness vs hoariness

whiteness and hoariness both are nouns.

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

As nouns, hoariness is a hyponym of whiteness; that is, hoariness 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)
hoariness: a silvery-white color

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

whiteness (noun)	hoariness (noun)
the quality or state of the achromatic color of greatest lightness (bearing the least resemblance to black)	great age (especially grey or white with age)
lightness or fairness of complexion	a silvery-white color
the state of being unsullied by sin or moral wrong; lacking a knowledge of evil