eloquence — Fluent or persuasive speaking or writing.
facility — Often, facilities. something designed, built, installed, etc., to serve a specific function affording a convenience or service: transportation facilities; educational facilities; a new research facility. something that permits the easier performance of an action, course of conduct, etc.: to provide someone with every facility for accomplishing a task; to lack facilities for handling bulk mail.
fluency — spoken or written with ease: fluent French.
handiness — within easy reach; conveniently available; accessible: The aspirins are handy.
inclination — a disposition or bent, especially of the mind or will; a liking or preference: Much against his inclination, he was forced to resign.
maturity — the state of being mature; ripeness: The fruit will reach maturity in a few days.