Efficacy
Efficacy noun - The power to produce a desired result.
Use and efficacy are semantically related. in effectiveness topic. In some cases you can use "Use" instead a noun "Efficacy", when it comes to topics like efficiency.
Use
Use noun - The act or practice of employing something for a particular purpose.
Mutual synonyms
How words are described
Both words in one sentence
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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.
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It is frequently forgotten that the primary reason that muskets took over from bows was not their greater efficacy, but rather the fact that they were much easier to train men how to use properly.
Source: Rock Beats Laser
Cite this Source
Use and Efficacy. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/efficacy/use
Efficacy & Use. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/efficacy/use>.
Use or Efficacy. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/efficacy/use.
Google Ngram Viewer shows how "efficacy" and "use" have occurred on timeline