Letter on position 1 (t) changed: 13 words bans cans dans eans fans gans kans mans nans pans sans vans wans Letter on position 2 (a) changed: 4 words tens tins tons tuns Letter on position 3 (n) changed: 16 words tabs tads taes tags tais taks tams taos taps tars tass tats taus tavs taws tays Letter on position 4 (s) changed: 5 words tana tane tang tanh tank