Letter on position 1 (b) changed: 7 words curls furls gurls hurls murls nurls purls Letter on position 2 (u) changed: 2 words birls byrls Letter on position 3 (r) changed: 2 words buhls bulls Letter on position 4 (l) changed: 8 words buras burbs burds burgs burks burns burps burrs Letter on position 5 (s) changed: 1 word burly