legibility vs discernability

legibility and discernability both are nouns.

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

As nouns, legibility and discernability are synonyms defined as:

legibility (noun)	discernability (noun)
a quality of writing (print or handwriting) that can be easily read	distinctness that makes perception easy
distinctness that makes perception easy