harshness vs raggedness

harshness and raggedness both are nouns.

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

As nouns, raggedness is a hypernym of harshness; that is, raggedness is a word with a broader meaning than harshness:

harshness: the roughness of a substance that causes abrasions
raggedness: a texture of a surface or edge that is not smooth but is irregular and uneven

Other hypernyms of harshness include roughness.

harshness (noun)	raggedness (noun)
the quality of being harsh or rough or grating to the senses	shabbiness by virtue of being in rags
excessive sternness	a texture of a surface or edge that is not smooth but is irregular and uneven
the roughness of a substance that causes abrasions
the quality of being cruel and causing tension or annoyance