graininess vs coarseness

graininess and coarseness both are nouns.

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

As nouns, graininess and coarseness are synonyms defined as:

graininess and coarseness: the quality of being composed of relatively large particles

Other synonyms of graininess include granularity.

graininess (noun)	coarseness (noun)
the quality of being composed of relatively large particles	looseness or roughness in texture (as of cloth)
	the quality of being composed of relatively large particles
	the quality of lacking taste and refinement
	language or humor that is down-to-earth