Letter on position 1 (m) changed: 6 words bass jass lass pass sass tass Letter on position 2 (a) changed: 4 words mess miss moss muss Letter on position 3 (s) changed: 14 words maas macs mads maes mags maks mals mams mans maps mars mats maws mays Letter on position 4 (s) changed: 6 words masa mase mash mask mast masu