Letter on position 1 (b) changed: 13 words cans dans eans fans gans kans mans nans pans sans tans vans wans Letter on position 2 (a) changed: 3 words bens bins buns Letter on position 3 (n) changed: 11 words baas bacs bads bags bals bams baps bars bass bats bays Letter on position 4 (s) changed: 7 words banc band bane bang bani bank bant