A vale is a valley, also a common township name in Wales.
To vail is to take off your hat in a sign of respect. It is so archaic we were not able to find modern examples of its use. In the U.S., the word is more commonly associated with the Vail ski resort in Colorado.
A veil is a piece of cloth worn over the head and sometimes face, normally associated with women and brides. To veil something is to obscure it or hide it, as a veil does.