| 100% | PHOTON | 6 | Particle that is its own antiparticle |
| 60% | ONE | 3 | Number that is its own square root |
| 59% | PAT | 3 | Word that is its own synonym when spelled backward |
| 49% | SHE | 3 | Word that becomes its own opposite if its first letter is removed |
| 49% | PACT | 4 | Word that becomes its own synonym when “com-” is added to it |
| 48% | EVER | 4 | Word that becomes its own opposite when "n" is added to the front |
| 48% | ION | 3 | Particle that is charged |
| 47% | SUPER | 5 | Word that's its own synonym when a "b" is added to the end |
| 47% | BAN | 3 | Word that becomes its own synonym when the last letter is changed to "r" |
| 46% | AYE | 3 | Word that becomes its own synonym when its first letter is moved to the end |
| 46% | CITED | 5 | Word that becomes its own synonym when RED is inserted between its first two letters |
| 46% | CHARY | 5 | Word that's its own synonym when its first two letters are replaced with "w" |
| 46% | VILE | 4 | Word that becomes its own synonym if the last letter is moved to the front |
| 46% | REWARD | 6 | "Virtue is its own —" |
| 46% | REWARD | 6 | Virtue is its own __ |
| 46% | ION | 3 | Particle that is either positive or negative |
| 45% | ION | 3 | Charged particle that is not neutral |
| 45% | AHA | 3 | "So that was it all along!" |
| 44% | EVENIF | 6 | Were it possible that |
| 44% | RAZE | 4 | Word whose antonym is its own homophone |
| 44% | PION | 4 | Subatomic particle that is a nuclear binder |
| 44% | ION | 3 | Particle that may be positive |
| 44% | ATOM | 4 | Particle that might be ionized |
| 43% | EMERSON | 7 | "Beauty is its own excuse for Being" writer |
| 43% | PROPERTY | 8 | Stuff that is owned |
| 42% | QUARK | 5 | Particle that can't be directly observed |
| 42% | ION | 3 | Particle that could be positive or negative |
| 42% | MACAO | 5 | Asian territory that has its own National Olympic Committee but is not allowed to compete at the Olympic Games |
| 42% | NEUTRINOS | 9 | Particles that may be created through beta decay |
| 41% | ATOM | 4 | Tiny particle that can be split |