Letter on position 1 (b) changed: 10 words call fall gall hall lall mall pall sall tall wall Letter on position 2 (a) changed: 4 words bell bill boll bull Letter on position 3 (l) changed: 4 words baal bael bail bawl Letter on position 4 (l) changed: 6 words bald bale balk balm bals balu