| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Abstract | 8 | 6 | 2 | 2 |
| Abstraction | 11 | 7 | 4 | 3 |
| Abstruse | 8 | 5 | 3 | 2 |
| Alien | 5 | 2 | 3 | 4 |
| Buried | 6 | 3 | 3 | 2 |
| Cabalistic | 10 | 6 | 4 | 4 |
| Censored | 8 | 5 | 3 | 2 |
| Classified | 10 | 6 | 4 | 3 |
| Close | 5 | 3 | 2 | 1 |
| Closed | 6 | 4 | 2 | 1 |
| Closed Book | 11 | 7 | 4 | 3 |
| Closing Curtain | 15 | 10 | 5 | 4 |
| Concealed | 9 | 5 | 4 | 2 |
| Cryptic | 7 | 6 | 1 | 2 |
| Cryptical | 9 | 7 | 2 | 3 |
| Dark | 4 | 3 | 1 | 1 |
| Darkness | 8 | 6 | 2 | 2 |
| Deep | 4 | 2 | 2 | 1 |
| Dehumanised | 11 | 6 | 5 | 4 |
| Dehumanized | 11 | 6 | 5 | 5 |
| Eerie | 5 | 1 | 4 | 2 |
| Eery | 4 | 2 | 2 | 2 |
| Eldritch | 8 | 6 | 2 | 2 |
| Elfin | 5 | 3 | 2 | 2 |
| Enigma | 6 | 3 | 3 | 3 |
| Enigmatic | 9 | 5 | 4 | 4 |
| Esoteric | 8 | 4 | 4 | 4 |
| Extramundane | 12 | 7 | 5 | 4 |
| Extraterrestrial | 16 | 10 | 6 | 6 |
| Extraterrestrial Being | 22 | 14 | 8 | 8 |
| Fey | 3 | 2 | 1 | 1 |
| Finale | 6 | 3 | 3 | 2 |
| Finis | 5 | 3 | 2 | 2 |
| Futurea | 7 | 3 | 4 | 3 |
| Hermetic | 8 | 5 | 3 | 3 |

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