If you use legacy form fields to build the form, you can set a limit on the number of
characters the user can enter in each text form field, by opening the field's Properties dialog and entering a number in the "Maximum length" box. However, the field has no way to count
words.
Working with macros, you could create a
userform (a custom dialog box) to accept the user's input, and the code of the userform can count the words to limit the input. If you don't have at least some programming background, though, this isn't the project I'd choose as a first introduction.
