No items removed from the list

I am using Python 3.5 and my code is

words = open("wordlist.txt").readlines()
words = [k[:-2] for k in words]
noletters = ["b", "d", "f", "g", "h", "i", "j", "k", "l", "p", "q", "t", "y"]
for n in words:
    for i in n:
        if i in noletters:
            words.remove(n)
            break
words.sort()
words.sort(key = len)
print(words)

      

        
        
        
      

    

Here wordlist.txt

is a really, really, really long list of words . First, I remove unnecessary characters from each item in the list, and then I end up with a list where each item is a word - something like 'hello'

or yugoslavia

. It still works.

Then I create a list of letters that I do not want in any of the words I get from the program. Then, for each item in the list, I check every letter in the word, and if the letter is in the list, I remove the word from the list and exit the inner loop that checks the letters (this prevents the system from trying to remove what has already been removed). Then I sort the list alphabetically and by word length and the list is printed.

Problems:

• Nothing is removed from the list by loops and I have no idea why. Of course it hits the loops - I've added a few print statements (after the print line words.remove(n)
  
  when something was deleted, and also after the line break
  
  to see when it went to a new word).
• The operator that sorts by string length also adds a bunch of things that were never in the word list - for example, 'o'
  
  it wasn't in the list, but it was added along with several empty strings ( ''
  
  ), etc. - it looked like every possible combination of every letter of the alphabet.