| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Charming | 8 | 6 | 2 | 2 |
| Chronic | 7 | 5 | 2 | 2 |
| Cogent | 6 | 4 | 2 | 2 |
| Competent | 9 | 6 | 3 | 3 |
| Compulsive | 10 | 6 | 4 | 3 |
| Computable | 10 | 6 | 4 | 4 |
| Conclusive | 10 | 6 | 4 | 3 |
| Confirmed | 9 | 6 | 3 | 2 |
| Consequential | 13 | 7 | 6 | 4 |
| Constitutive | 12 | 7 | 5 | 4 |
| Corroborated | 12 | 7 | 5 | 5 |
| Creative | 8 | 4 | 4 | 2 |
| Critical | 8 | 5 | 3 | 3 |
| Crucial | 7 | 4 | 3 | 2 |
| Decisive | 8 | 4 | 4 | 3 |
| Demonstrated | 12 | 8 | 4 | 4 |
| Determinant | 11 | 7 | 4 | 4 |
| Determinative | 13 | 7 | 6 | 5 |
| Determined | 10 | 6 | 4 | 3 |
| Determiner | 10 | 6 | 4 | 4 |
| Determining Factor | 18 | 12 | 6 | 6 |
| Discovered | 10 | 6 | 4 | 3 |
| Doable | 6 | 3 | 3 | 2 |
| Docudrama | 9 | 5 | 4 | 4 |
| Dressing | 8 | 6 | 2 | 2 |
| Driven | 6 | 4 | 2 | 2 |
| Effective | 9 | 5 | 4 | 3 |
| Effectual | 9 | 5 | 4 | 4 |
| Efficacious | 11 | 5 | 6 | 4 |
| Efficient | 9 | 5 | 4 | 4 |
| Emphatic | 8 | 5 | 3 | 3 |
| Enchanting | 10 | 7 | 3 | 3 |
| Enthralling | 11 | 8 | 3 | 3 |
| Entrancing | 10 | 7 | 3 | 3 |
| Episodic | 8 | 4 | 4 | 4 |
Efficacious Synonyms
Cognitive synonyms list for efficacious, page 2. Efficacious is a 11 letter word, used as a article, an SAT word with Old French origins, and has the letters acceffiiosu (acefiosu). Starts with e, ends with s, five consonants, six vowels and four syllables.
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