Dictionary Check: efficaciousness

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"efficaciousness" is a valid word!

Scrabble 25 points

Words with Friends 29 points

noun

capacity or power to produce a desired effect

Example: "concern about the safety and efficacy of the vaccine"

Synonyms:

📖 Words starting with "e" 📖 Words starting with "ef" 📖 Words containing "ff" 🏅 Letter Scores