whiteness vs alabaster

whiteness and alabaster both are nouns.

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

As nouns, alabaster is a hyponym of whiteness; that is, alabaster 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)
alabaster: a very light white

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

whiteness (noun)	alabaster (noun)
the quality or state of the achromatic color of greatest lightness (bearing the least resemblance to black)	a very light white
lightness or fairness of complexion	a compact fine-textured, usually white gypsum used for carving
the state of being unsullied by sin or moral wrong; lacking a knowledge of evil	a hard compact kind of calcite

whiteness (adjective)	alabaster (adjective)
	of or resembling alabaster