Letter on position 1 (f) changed: 7 words cires hires mires sires tires vires wires Letter on position 2 (i) changed: 3 words fares feres fores Letter on position 3 (r) changed: 7 words fices fifes fikes files fines fives fixes Letter on position 4 (e) changed: 3 words firks firms firns Letter on position 5 (s) changed: 2 words fired firer