legibility vs illegibility

legibility and illegibility both are nouns.

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

legibility (noun)	illegibility (noun)
a quality of writing (print or handwriting) that can be easily read	the quality of writing (print or handwriting) that cannot be deciphered
distinctness that makes perception easy