How Many 5 Letter Words Are There?

There are 26^5 (or 11,881,376) possible five-letter words if each letter is chosen from the 26 letters of the alphabet. However, this number would be less if certain letters are not allowed or if the words must adhere to specific rules such as beginning with a certain letter or following a specific pattern. It is important to note that not all possible 5 letter words are actual words in English or any other language.