Letter on position 1 (y) changed: 13 words barks carks darks harks jarks karks larks marks narks parks rarks sarks warks Letter on position 2 (a) changed: 3 words yerks yirks yorks Letter on position 3 (r) changed: 2 words yacks yanks Letter on position 4 (k) changed: 3 words yards yarns yarrs