Letter on position 1 (t) changed: 6 words brills drills frills grills krills prills Letter on position 2 (r) changed: 2 words thills twills Letter on position 3 (i) changed: 2 words trolls trulls Letter on position 4 (l) changed: 2 words trials triols Letter on position 6 (s) changed: 1 word trillo