coarseness vs sandiness

coarseness and sandiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
coarseness	Yes	No	No	No
sandiness	Yes	No	No	No

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

coarseness (noun)	sandiness (noun)
looseness or roughness in texture (as of cloth)	a texture resembling that of sand
the quality of being composed of relatively large particles	The property of containing sand.
the quality of lacking taste and refinement
language or humor that is down-to-earth