Words formed when one letter is changed in fastnesses
Letter 1 (F) changed: 4 word found:
No words found when changing letter 2 (A).
No words found when changing letter 3 (S).
No words found when changing letter 4 (T).
No words found when changing letter 5 (N).
No words found when changing letter 6 (E).
No words found when changing letter 7 (S).
No words found when changing letter 8 (S).
No words found when changing letter 9 (E).
No words found when changing letter 10 (S).
A total of 4 words can be formed from fastnesses by changing one letter.