Letter on position 1 (t) changed: 12 words backs dacks hacks jacks lacks macks packs racks sacks wacks yacks zacks Letter on position 2 (a) changed: 3 words ticks tocks tucks Letter on position 3 (c) changed: 3 words talks tanks tasks Letter on position 4 (k) changed: 4 words taces tachs tacos tacts Letter on position 5 (s) changed: 1 word tacky