vail / vale / veil [veil]
vail – n. & v. – n. – 1. advantage, power; 2. worth, estimation; 3. sunset, dusk; v. – 1. prevail, profit, be of service; 2.submit, respect, yield, humble
vale – n. – low ground between hills, a valley
veil – n. & v. – n. – 1. a piece of cloth worn to conceal the head or face; 2. anything which hides something from view; v. – conceal from view