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There are 7 words beginning with EFFICA

EFFICACIES	• efficacies n. Plural of efficacy. • EFFICACY n. effectiveness.
EFFICACIOUS	• efficacious adj. (Formal) Effective; possessing efficacy. • EFFICACIOUS adj. having the power to produce a desired effect.
EFFICACIOUSLY	• efficaciously adv. In an efficacious manner. • EFFICACIOUS adv. having the power to produce a desired effect.
EFFICACIOUSNESS	• efficaciousness n. Quality of being efficacious. • EFFICACIOUS n. having the power to produce a desired effect.
EFFICACITIES	• efficacities n. Plural of efficacity. • EFFICACITY n. the state of being efficacious.
EFFICACITY	• efficacity n. Efficacy. • EFFICACITY n. the state of being efficacious.
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.

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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See this list for:

English Wiktionary: 7 words
Scrabble in French: 5 words
Scrabble in Spanish: no word
Scrabble in Italian: 5 words
Scrabble in German: no word
Scrabble in Romanian: no word

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