Letter on position 1 (m) changed: 5 words bacs lacs pacs sacs vacs Letter on position 2 (a) changed: 3 words mics mocs mycs Letter on position 3 (c) changed: 14 words maas mads maes mags maks mals mams mans maps mars mass mats maws mays Letter on position 4 (s) changed: 3 words mace mach mack