getwords.py

import itertools
import enchant
import sys

def getwords(letters, len):
    words = []
    d = enchant.Dict("en_US")
    for w in [''.join(x) for x in itertools.permutations(letters, len)]:
        if d.check(w):
            words.append(w)

    return words

if __name__ == '__main__':
    print '\n'.join(getwords(sys.argv[1], int(sys.argv[2])))