Noun
proficiency [pl. proficiencies]
perfection [pl. perfections]
finesse {phil.}
إِتْقان {فلسفة}
exactness {econ.}
إتقان {اقتصاد}
niceness [pl. nicenesses]
exactitude {educ.}
إِتْقان {تعليم}
squeamishness {feelings & emotions}
...