Letter on position 1 (w) changed: 13 words barks carks darks harks jarks karks larks marks narks parks rarks sarks yarks Letter on position 2 (a) changed: 1 word works Letter on position 3 (r) changed: 4 words wacks walks wanks wauks Letter on position 4 (k) changed: 7 words warbs wards wares warms warns warps warts