| 100% | POS | 3 | Getters of letters: Abbr. |
| 70% | GPO | 3 | Collector of letters: Abbr. |
| 64% | POS | 3 | Letter getters: Abbr. |
| 64% | SOS | 3 | Letters of distress: Abbr. |
| 64% | ASAP | 4 | Letters of urgency: Abbr. |
| 64% | ATH | 3 | Letter getter: Abbr. |
| 64% | INIT | 4 | Letter of approval?: Abbr. |
| 60% | OMG | 3 | Letters of surprise, in text speak: Abbr. |
| 59% | ENC | 3 | Abbr. at the bottom of a letter |
| 59% | MESSRS | 6 | Abbr. at the head of a letter |
| 59% | ENCL | 4 | Abbr. at the bottom of a letter |
| 58% | ENCL | 4 | Abbr. at the bottom of a business letter |
| 58% | ENCS | 4 | Abbr. at the bottom of a business letter |
| 58% | ENC | 3 | Abbr. at the bottom of a business letter |
| 58% | ENCL | 4 | Abbr. on the bottom of a business letter |
| 57% | OBO | 3 | Letters following the price of a used car: Abbr. |
| 57% | ENCS | 4 | Accompaniers of cover letters: Abbr. |
| 57% | APO | 3 | Receiver of private letters?: Abbr. |
| 56% | AET | 3 | Three letter abbr. sometimes seen on gravestones meaning "at the age of" |
| 56% | AKA | 3 | Letters between real and stage name of a celebrity: Abbr. |
| 56% | OBO | 3 | Letters following the price of a used car, maybe: Abbr. |
| 55% | TGIF | 4 | Joyful letters at the end of the week: Abbr. |
| 55% | PSS | 3 | Additions at the ends of letters (abbr.) |
| 54% | USS | 3 | Letters at the start of an American navy vessel's name: Abbr. |
| 54% | ARR | 3 | What the last letter of 13-Across stands for: Abbr. |
| 54% | CAL | 3 | What the second letter of 17-Down stands for: Abbr. |
| 54% | SYS | 3 | What the last letter of 55-Across stands for: Abbr. |
| 53% | PTS | 3 | The letter Q is worth 10 of them in Scrabble: Abbr. |
| 52% | TENN | 4 | Fourth of four US states that are 8-Down letters long: Abbr. |
| 52% | MINN | 4 | First of four US states that are 8-Down letters long: Abbr. |