I. -ability /əbɪləti, əbɪlɪti/ BrE AmE ( also -ibility ) suffix
[ Language: Old French ; Origin: -abilité , from Latin -abilitas , from -abilis ; ⇨ ↑ -able ]
makes nouns from adjectives ending in ↑ -able and ↑ -ible :
manageability
II. -ibility /əbɪləti, ɪbɪləti/ BrE AmE suffix [in nouns]
another form of the suffix ↑ -ability :
invincibility
flexibility