graininess vs granularity

graininess and granularity both are nouns.

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

As nouns, graininess and granularity are synonyms defined as:

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

Other synonyms of graininess include coarseness.

graininess (noun)	granularity (noun)
the quality of being composed of relatively large particles	the quality of being composed of relatively large particles