| 100% | ERAS | 4 | Periods named for monarchs |
| 88% | ERA | 3 | Period named for a monarch, perhaps |
| 83% | ERAS | 4 | Periods often named for monarchs |
| 71% | ERA | 3 | Time period often named for a monarch |
| 69% | ERAS | 4 | Periods named for presidents |
| 69% | ERA | 3 | Period named for something |
| 68% | ERAS | 4 | Periods named for music genres |
| 68% | ERA | 3 | Period named for a genre |
| 67% | ERAS | 4 | Periods named for football coaches, perhaps |
| 67% | ERA | 3 | Period named for a music genre |
| 67% | MAY | 3 | Period named for an earth goddess |
| 66% | ERAS | 4 | Periods named for music genres, at times |
| 66% | ERAS | 4 | Time spans named for monarchs |
| 63% | DOGDAYS | 7 | Hot summer period named for the constellation Sirius |
| 62% | BRONZEAGE | 9 | Historic period named for a copper alloy: 2 wds. |
| 61% | MONDAY | 6 | 24-hour period named for the day of the moon |
| 60% | ERA | 3 | Time period named for a sports franchise's head coach, perhaps |
| 57% | ERAS | 4 | Periods sometimes named for presidents |
| 57% | ERAS | 4 | Periods often named for rulers |
| 57% | ERAS | 4 | Periods often named for presidents |
| 57% | ERAS | 4 | Periods often named for leaders |
| 57% | RUSHHOUR | 8 | Ironically named period for commuters |
| 56% | ERA | 3 | Stretch of time sometimes named for a monarch or president |
| 56% | ERAS | 4 | Periods often named for music genres |
| 55% | ERA | 3 | Period often named for a leader |
| 55% | ERA | 3 | Period often named for a president |
| 55% | EON | 3 | ___ Productions (James Bond film company, named for a period of time) |
| 54% | ERA | 3 | Period sometimes named for a music genre |
| 54% | BRASSERA | 8 | Early auto-manufacturing period named for the material used in the fittings for radiators and lights |
| 51% | ERAS | 4 | Time periods sometimes named for presidents |