Letter on position 1 (s) changed: 5 words bacs lacs macs pacs vacs Letter on position 2 (a) changed: 3 words secs sics socs Letter on position 3 (c) changed: 13 words sabs sads sags sais sals sams sans saps sars sass savs saws says Letter on position 4 (s) changed: 1 word sack