Letter on position 1 (p) changed: 18 words bills cills dills fills gills hills jills kills lills mills nills rills sills tills vills wills yills zills Letter on position 2 (i) changed: 4 words palls pells polls pulls Letter on position 3 (l) changed: 1 word pirls Letter on position 4 (l) changed: 3 words piles pilis pilus