| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Coda | 4 | 2 | 2 | 2 |
| Collocation | 11 | 6 | 5 | 4 |
| Complement | 10 | 7 | 3 | 3 |
| Concentration | 13 | 8 | 5 | 4 |
| Concomitant | 11 | 7 | 4 | 4 |
| Condensation | 12 | 7 | 5 | 4 |
| Condensing | 10 | 7 | 3 | 3 |
| Conditional Reaction | 20 | 11 | 9 | 6 |
| Conditional Reflex | 18 | 11 | 7 | 6 |
| Conditional Response | 20 | 12 | 8 | 7 |
| Conditioned Reaction | 20 | 11 | 9 | 6 |
| Conditioned Reflex | 18 | 11 | 7 | 6 |
| Conditioned Response | 20 | 12 | 8 | 7 |
| Conditioning | 12 | 7 | 5 | 4 |
| Conduct | 7 | 5 | 2 | 2 |
| Confirmation | 12 | 7 | 5 | 4 |
| Conjugation | 11 | 6 | 5 | 4 |
| Connection | 10 | 6 | 4 | 3 |
| Connexion | 9 | 5 | 4 | 3 |
| Consolidation | 13 | 7 | 6 | 5 |
| Continuance | 11 | 6 | 5 | 4 |
| Continuation | 12 | 6 | 6 | 5 |
| Cookery | 7 | 4 | 3 | 3 |
| Cooking | 7 | 4 | 3 | 2 |
| Corollary | 9 | 6 | 3 | 4 |
| Corroboration | 13 | 7 | 6 | 5 |
| Corroboratory Evidence | 22 | 13 | 9 | 8 |
| Corset | 6 | 4 | 2 | 2 |
| Crest | 5 | 4 | 1 | 1 |
| Crook | 5 | 3 | 2 | 1 |
| Crutch | 6 | 5 | 1 | 1 |
| Deepening | 9 | 5 | 4 | 3 |
| Determination | 13 | 7 | 6 | 5 |
| De Broglie Wave | 15 | 9 | 6 | 4 |
| Diffraction | 11 | 7 | 4 | 3 |

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