Letter on position 1 (b) changed: 13 words cigs digs figs gigs jigs ligs migs pigs rigs tigs vigs wigs zigs Letter on position 2 (i) changed: 4 words bags begs bogs bugs Letter on position 3 (g) changed: 6 words bias bibs bids bins bios bits Letter on position 4 (s) changed: 2 words biga bigg