Letter on position 1 (f) changed: 13 words bans cans dans eans gans kans mans nans pans sans tans vans wans Letter on position 2 (a) changed: 4 words fens fins fons funs Letter on position 3 (n) changed: 9 words faas fabs fads fags fahs fars fats faws fays Letter on position 4 (s) changed: 5 words fand fane fang fank fano