harshness vs scratchiness

harshness and scratchiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
harshness	Yes	No	No	No
scratchiness	Yes	No	No	No

As nouns, harshness and scratchiness are synonyms defined as:

harshness and scratchiness: the roughness of a substance that causes abrasions

Other synonyms of harshness include abrasiveness.

harshness (noun)	scratchiness (noun)
the quality of being harsh or rough or grating to the senses	the roughness of a substance that causes abrasions
excessive sternness
the roughness of a substance that causes abrasions
the quality of being cruel and causing tension or annoyance