Capability: the quality of being capable; practical ability it also implies possibility it has future oriented meaning it is the potential level of development Ability: power to do (something physical or mental) it is your skill, expertness, talent, aptitude what you can already do it is what we can do at present it is the actual level of development for example: your capability is to lift 60kg weight. But you are not able to lift because of some problem.

Ability is a the quality of being able to perform; a quality that permits or facilitates achievement or accomplishment. Capability is the quality of being capable -- physically or intellectually or legally Faculty is the body of teachers and administrators at a school cowboy...

faculty is kind of an innate ability however i cannot tell exactly the difference between ability and capacity