granularity vs graininess

granularity and graininess both are nouns.

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

As nouns, granularity and graininess are synonyms defined as:

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

Other synonyms of granularity include coarseness.

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