harsh vs abrasive

harsh is not a noun while abrasive is a noun.

Word	Noun	Adjective	Verb	Adverb
harsh	No	Yes	No	No
abrasive	Yes	Yes	No	No

As adjectives, harsh and abrasive are synonyms defined as:

harsh (noun)	abrasive (noun)
	a substance that abrades or wears down

harsh (adjective)	abrasive (adjective)
of textures that are rough to the touch or substances consisting of relatively large particles	sharply disagreeable; rigorous
sharply disagreeable; rigorous	causing abrasion
severe
unkind or cruel or uncivil
unpleasantly stern
unpleasantly rough or jarring to the senses