sharpness vs clearness

sharpness and clearness both are nouns.

Word	Noun	Adjective	Verb	Adverb
sharpness	Yes	No	No	No
clearness	Yes	No	No	No

As nouns, clearness is a hypernym of sharpness; that is, clearness is a word with a broader meaning than sharpness:

Other hypernyms of sharpness include clarity, uncloudedness.

sharpness (noun)	clearness (noun)
harshness of manner	free from obscurity and easy to understand; the comprehensibility of clear expression
thinness of edge or fineness of point	the quality of clear water
a strong odor or taste property
the quality of being sharp and clear
the attribute of urgency in tone of voice
the quality of being keenly and painfully felt
a quick and penetrating intelligence