permissible vs permissibility

permissible is not a noun while permissibility is a noun.

Word	Noun	Adjective	Verb	Adverb
permissible	No	Yes	No	No
permissibility	Yes	No	No	No

permissible (noun)	permissibility (noun)
	admissibility as a consequence of being permitted

permissible (adjective)	permissibility (adjective)
that may be permitted especially as according to rule
that may be accepted or conceded