faculty 指内在的力量或能力 An inherent power or ability
ability是指智力或体力上具有做某事的能力 the power,mental or physical,to do sth.
capacity是指天赋的 an innate potential for growth,development,or accomplishment
capability指一种可能得到发展或应用的才能或能力 a talent or ability that has potential for development or use
总的来说 差别不大 不要过分强调区别