Letter on position 1 (c) changed: 12 words bops dops fops hops kops lops mops oops pops sops tops wops Letter on position 2 (o) changed: 3 words caps ceps cups Letter on position 3 (p) changed: 12 words cobs cods cogs cols coms cons coos cors coss cots cows coys Letter on position 4 (s) changed: 2 words cope copy