grating vs scratchy

grating is a noun but scratchy is not a noun.

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

As adjectives, grating and scratchy are synonyms defined as:

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

grating (noun)	scratchy (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

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