sharpness vs legibility

sharpness and legibility both are nouns.

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

As nouns, legibility is a hyponym of sharpness; that is, legibility is a word with a more specific, narrower meaning than sharpness:

Other hyponyms of sharpness include definition, discernability, focus.

sharpness (noun)	legibility (noun)
harshness of manner	a quality of writing (print or handwriting) that can be easily read
thinness of edge or fineness of point	distinctness that makes perception easy
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