Letter on position 1 (b) changed: 10 words cuts guts huts juts muts nuts outs puts ruts tuts Letter on position 2 (u) changed: 4 words bats bets bits bots Letter on position 3 (t) changed: 8 words bubs buds bugs bums buns burs buss buys Letter on position 4 (s) changed: 2 words bute butt