One of the most unusual letters of the English alphabet is z. Not many words contain the letter z, not to mention begin with z. It is the last letter of the English alphabet. The letter z is used the least often when compared to other letters. However, some other letters have the z sound but are spelled with a different letter. Most of the words that contain z usually have a silent e on the end or is at least followed by an e. For instance, froze and frozen follow that rule. It is even more infrequent for there to be a z in a word that only has four letters. Most of those words would be near the end of the word, but there are some words that contain four letters that start with z.