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There are 2 words containing EFFICACY

EFFICACY	• efficacy n. Ability to produce a desired effect under ideal testing conditions. • efficacy n. Degree of ability to produce a desired effect; effectiveness. • EFFICACY n. effectiveness.
INEFFICACY	• inefficacy n. The condition of being ineffective. • INEFFICACY n. lack of power to produce a desired effect, also INEFFICACITY.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 8 words
Scrabble in French: no word
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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