Add script for noun coverage testing
Improve double vowel in noun last syllable

1-arg noun coverage now exactly 80%.

  14054
   1379 2-3-4-5-6
    444 3-5-6
    425 3-4-5-6
    268 2-3-4-5
    251 5-6
    225 2
    186 6
    112 2-4-6
     58 3
     55 2-4-5-6
     50 2-3-5-6
     32 2-4
      9 3-5
      1 4-6
      1 2-3-4-6
      1 2-3-4