| 100% | GAUGE | 5 | HO or O, for model trains |
| 71% | SCALE | 5 | Model railroader's HO or O, for example |
| 47% | VIET | 4 | Ho or Ngo, for short |
| 47% | MAG | 3 | GQ or O, for short |
| 45% | TYPE | 4 | A, B, AB, or O, for blood |
| 43% | ISLAND | 6 | Bora Bora, Crete or O'ahu, for example |
| 43% | MOCKUP | 6 | Model used for study or testing |
| 42% | SLEEPER | 7 | Train or rail carriage for overnight passengers |
| 42% | BLOODTYPE | 9 | O positive or AB negative for example |
| 41% | PERIODICTABLE | 13 | Place for I, O or U |
| 41% | MAG | 3 | O, T, or W, for short |
| 40% | TIMETABLE | 9 | Schedule of buses or trains, for example |
| 40% | CASTING | 7 | Selecting dancers or models for a show |
| 40% | TEENPOP | 7 | Genre for O-Town or Aly & AJ |
| 39% | CONDUCTOR | 9 | Official on a train … or for an orchestra |
| 39% | GSCALE | 6 | Proportionate size for some model trains |
| 39% | ART | 3 | Field for Robert Indiana or Georgia O'Keeffe |
| 39% | HUB | 3 | Chicago O'Hare or Denver International, for United |
| 39% | ETA | 3 | When a plane or train is due, for short |
| 39% | TICKET | 6 | Paper receipt for using on a train or bus |
| 39% | STA | 3 | Place to catch a bus or train, for short |
| 38% | TALK | 4 | TV show format for Ellen DeGeneres or Conan O'Brien |
| 37% | RODE | 4 | Went by train or taxi, for example |
| 37% | ATNO | 4 | Fig. for I, O or U, but not A or E |
| 37% | ONE | 3 | Point value for A, E, I, O, or U in Scrabble |
| 36% | ERT | 3 | People trained to prepare for natural disasters or unexpected incidents, for short |
| 35% | PUB | 3 | New York's McSorley's or Missouri's O'Malley's, for example |
| 35% | THERIGHTTRACK | 13 | Perfect gift for a model train buff? |
| 35% | ERIN | 4 | Land for O'Connor or O'Casey |
| 35% | DON | 3 | Ho or Giovanni |