scratchy vs grating

scratchy is not a noun while grating is a noun.

Word	Noun	Adjective	Verb	Adverb
scratchy	No	Yes	No	No
grating	Yes	Yes	No	No

As adjectives, scratchy and grating are synonyms defined as:

Other synonyms of scratchy include gravelly, rasping, raspy, rough.

scratchy (noun)	grating (noun)
	a barrier that has parallel or crossed bars blocking a passage but admitting air
	a frame of iron bars to hold a fire
	optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum

scratchy (adjective)	grating (adjective)
unpleasantly harsh or grating in sound	unpleasantly harsh or grating in sound
easily irritated or annoyed
lacking consistency
causing abrasion