abrasive vs harsh

abrasive is a noun but harsh is not a noun.

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

As adjectives, abrasive and harsh are synonyms defined as:

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

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