| 100% | FOUR | 4 | IV, in numerics |
| 68% | TEN | 3 | X, in numerics |
| 58% | TOPICOFCANCER | 13 | *Volume IV in a series on astrology? |
| 57% | VII | 3 | III + IV, in ancient Rome |
| 55% | INTRA | 5 | The "I" in IV |
| 55% | SERA | 4 | Fluids in IV bags |
| 55% | INTRA | 5 | The I in IV |
| 54% | III | 3 | One less than IV, in Roman numerals |
| 54% | ROKU | 4 | IV device found in many homes nowadays |
| 54% | ANT | 3 | Menacing insect in "Phase IV" |
| 53% | CMI | 3 | Year in Benedict IV's papacy |
| 53% | HOTSPUR | 7 | Rebel in "Henry IV, Part 1" |
| 51% | GLENDOWER | 9 | Hotspur ally in "Henry IV Part 1" |
| 51% | AFL | 3 | Org. in Super Bowls I to IV |
| 51% | IVAN | 4 | ___ Drago, opponent of Rocky in "Rocky IV" |
| 51% | OSLO | 4 | City renamed in 1624 by Christian IV |
| 51% | IVAN | 4 | ___ Drago (Rocky's opponent in "Rocky IV") |
| 51% | HAL | 3 | Prince in both parts of "Henry IV" |
| 51% | IVAN | 4 | Dolph Lundgren's role in "Rocky IV" |
| 50% | GLENDOWER | 9 | Owen ___, rebel in Shakespeare's "King Henry IV" |
| 50% | MELCHETT | 8 | General __, Stephen Fry alter ego in Blackadder IV |
| 50% | HAL | 3 | Prince ___ in Shakespeare's "Henry IV, Part 1" |
| 48% | EDWARD | 6 | Father of the two "Princes in the Tower": __ IV |
| 48% | MELCHETT | 8 | WWI general played by Stephen Fry in Blackadder IV |
| 48% | INN | 3 | The Boar's Head in "Henry IV," e.g. |
| 48% | CCCP | 4 | Letters on Drago's track suit in "Rocky IV" |
| 47% | ALPHA | 5 | Numeric lead-in |
| 47% | ROAN | 4 | Horse ridden by Hotspur in "King Henry IV, Part I" |
| 47% | ROAN | 4 | Like Hotspur's horse in "King Henry IV, Part I" |
| 47% | IVAN | 4 | ___ Drago (Soviet boxer played by Dolph Lundgren in "Rocky IV") |