Beginner word-guessing game
Firstly, your function names do not conform to standards. For example, typeYourword should be typeYourWord, thought I'd suggest actually using something similar to inputWord, so the verb is related to what the program does rather than the user.

You should read PEP 8, or set your GUI (If you are using one) to warn you of violations of the standard. For example, you are missing a lot of spaces around your operators. For example, b=raw_input("type your letter again \n") should be b = raw_input("type your letter again \n").

Your indent length varies between different functions making the code a bit harder to reason about.

The use of global variables is frowned upon. You are already returning the variable from typeYourword, so consider storing this in a variable and passing it into the other functions. For example:

word = typeYourword()
monmot(word)


monmot appears to have no function, as strings can already be indexed, though perhaps I am not seeing something there.

You do checks for greater than or less than when you could just be using the != operator to check for inequality (while len(yourword) != 4)

Code that is run when the module is loaded directly (the last three lines) should be contained within a check for __name__ == "__main__"

You do not need the else clause on the while loops, this is mainly for complicated loops involving break statements, and you can just outdent your code: 

  while len(yourword)&lt;4 or len(yourword)&gt;4:
    yourword= raw_input("type your word again \n")
  print("Now your word : ",yourword," has the correct format")
  return yourword


Hopefully this can help you, and comment if you want anything I've said to be clarified