Discernability is a synonym of perceptibility.
As nouns the difference between perceptibility and discernability
is that perceptibility is the state, quality, or condition of being perceptible while discernability is the state of being discernable.
perceptibility
English
Noun
(-)
The state, quality, or condition of being perceptible.
discernability
English
Noun
(-)
The state of being discernable.
Synonyms
* noticeableness
* perceptibility