Letter on position 1 (s) changed: 10 words buns duns funs guns huns muns nuns puns runs tuns Letter on position 2 (u) changed: 4 words sans sens sins sons Letter on position 3 (n) changed: 8 words subs suds sues suks sums sups suqs suss Letter on position 4 (s) changed: 3 words sung sunk sunn