| 100% | ISSUANT | 7 | Having only the forepart visible, in heraldry |
| 94% | ISSUANT | 7 | Having only the forepart visible, as a beast in heraldry |
| 49% | EARED | 5 | In heraldry, having small projections in the upper corners |
| 47% | EYES | 4 | Only body parts visible in the dark, often, in cartoons |
| 44% | NEPTUNE | 7 | Only planet in the solar system not visible to the naked eye |
| 44% | RIDDLE | 6 | Judges 14:14 has the only one in the Bible |
| 43% | STREISAND | 9 | Only artist to have a #1 album in every decade since the 1960s |
| 42% | MEANSWELL | 9 | Has only the best intentions |
| 42% | DOROTHY | 7 | Character who sings with the Scarecrow in "If I Only Had a Brain" |
| 41% | DEIONSANDERS | 12 | Only athlete to have played in both the World Series and the Super Bowl: 2 wds. |
| 41% | CHER | 4 | The only artist to have a #1 song on a Billboard chart in six consecutive decades |
| 40% | SIG | 3 | Hansen, captain of the only vessel to have appeared in every season of "Deadliest Catch" |
| 40% | THEATER | 7 | "The only institution in the world which has been dying for four thousand years," per John Steinbeck |
| 40% | MARINER | 7 | Member of the only M.L.B. team never to have played in a World Series |
| 40% | CRICKET | 7 | I have thin wings and long legs. I chirp only in the night. Who am I? |
| 40% | VERT | 4 | In heraldry, the colour green |
| 40% | AZURE | 5 | In heraldry, the colour blue |
| 40% | GULES | 5 | In heraldry, the colour red |
| 40% | ARGENT | 6 | In heraldry, the colour silver |
| 39% | ISSUANT | 7 | Having only the upper part showing, as a heraldic beast |
| 39% | CARTER | 6 | Vince ___, former basketball player and the only player to have played in 22 seasons in NBA history |
| 38% | MARINERS | 8 | Other than the Nationals, only current Major League Baseball team never to have played in a World Series |
| 38% | BELUSHI | 7 | Only person to have the #1 movie, #1 album and #1-rated late-night TV show all in the same week |
| 38% | LBJ | 3 | Only politician in the 20th century, other than RMN, to have been president, VP and member of the House and Senate |
| 37% | NOLONGER | 8 | Only in the past |
| 37% | TOWN | 4 | The only game in ___ |
| 37% | NOSAY | 5 | Have _____ in the matter |
| 37% | HAST | 4 | Have in the past |
| 37% | ALULL | 5 | Have ___ in the conversation |
| 37% | SNACKON | 7 | Have in the interim |