Letter on position 1 (m) changed: 12 words backs dacks hacks jacks lacks packs racks sacks tacks wacks yacks zacks Letter on position 2 (a) changed: 4 words mecks micks mocks mucks Letter on position 3 (c) changed: 4 words maiks marks masks mawks Letter on position 4 (k) changed: 2 words maces machs