Letter on position 1 (c) changed: 13 words barks darks harks jarks karks larks marks narks parks rarks sarks warks yarks Letter on position 2 (a) changed: 1 word corks Letter on position 3 (r) changed: 4 words calks casks cauks cawks Letter on position 4 (k) changed: 8 words carbs cards cares carls carns carps carrs carts