Efficacy
Efficacy noun - The power to produce a desired result.
Power is a synonym for efficacy in property topic. In some cases you can use "Power" instead a noun "Efficacy", when it comes to topics like thing, effect, effectiveness, cost-effectiveness.
Mutual synonyms
How words are described
| high | high efficacy | high power |
| actual | actual efficacy | actual power |
| little | little efficacy | little power |
| supernatural | supernatural efficacy | supernatural power |
| Other adjectives: significant, greater, magical. | ||
Both words in one sentence
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In terms of realism, this has some ground as traditional and even some current practitioners of martial arts hold the belief that accompanying statements and/or vocal noises alongside execution build up their chi, thereby increasing the power and efficacy of their moves and techniques.
Source: Calling Your Attacks - The final case of Trials and Tribulations does break rule 2, but by that point the player is already familiar with the supernatural power in question and its efficacy.
Source: Fair-Play Whodunnit -
The Strength stat determines a character's Health and the Will stat determines their Power Points and Overflow Gauge, all of which limit an esper's ability to use psi-talents; the Wits stat directly affects the efficacy of those talents, as well as determining how many talents an esper starts with.
Cite this Source
Power and Efficacy. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/efficacy/power
Efficacy & Power. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/efficacy/power>.
Power or Efficacy. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/efficacy/power.
Google Ngram Viewer shows how "efficacy" and "power" have occurred on timeline