All Words: internal, eternal, sempiternal, infernal, external, vernal, sternal, fraternal, maternal, asternal, supernal, ternal, paternal, hibernal, and coeternal
| Word | Length | Vowels | Syllables | |||
|---|---|---|---|---|---|---|
| Internal | 8 | 5 | 3 | 3 | Medieval Latin | |
| Eternal | 7 | 4 | 3 | 3 | Old French | |
| Sempiternal | 11 | 7 | 4 | 4 | Medieval Latin | |
| Infernal | 8 | 5 | 3 | 3 | Middle French | |
| External | 8 | 5 | 3 | 3 | Middle French | |
| Vernal | 6 | 4 | 2 | 2 | Latin | |
| Sternal | 7 | 5 | 2 | 2 | ||
| Fraternal | 9 | 6 | 3 | 3 | Middle French | |
| Maternal | 8 | 5 | 3 | 3 | Middle French | |
| Asternal | 8 | 5 | 3 | 3 | ||
| Supernal | 8 | 5 | 3 | 3 | Old French | |
| Ternal | 6 | 4 | 2 | 2 | ||
| Paternal | 8 | 5 | 3 | 3 | Old French | |
| Hibernal | 8 | 5 | 3 | 3 | Latin | |
| Coeternal | 9 | 5 | 4 | 3 |
Suffix: -ernal. List of words that end in ernal.

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