Letter on position 1 (b) changed: 10 words duns funs guns huns muns nuns puns runs suns tuns Letter on position 2 (u) changed: 3 words bans bens bins Letter on position 3 (n) changed: 8 words bubs buds bugs bums burs buss buts buys Letter on position 4 (s) changed: 6 words buna bund bung bunk bunn bunt