coarseness vs coarse

coarseness is a noun but coarse is not a noun.

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

coarseness (noun)	coarse (noun)
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

coarseness (adjective)	coarse (adjective)
	of textures that are rough to the touch or substances consisting of relatively large particles
	of low or inferior quality or value
	lacking refinement or cultivation or taste