Crossword Synonyms

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Synonyms for efficacious

17 crossword answers for efficacious (11), sorted by letter count. Words in bold mean the same thing; the rest are broader, narrower or related terms.

How many letters?

5 letters 2

6 letters 3

7 letters 1

8 letters 1

9 letters 5

10 letters 1

11 letters 2

13 letters 2