Ability and Efficacy

Ability

Ability noun - The physical or mental power to do something.

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Efficacy and ability are semantically related In some cases you can use "Efficacy" instead a noun "Ability".

Nearby Word: able

Efficacy noun - The power to produce a desired result.

Usage example: questioned the efficacy of the alarms in actually preventing auto theft

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Ability and efficacy are semantically related in efficiency topic. Sometimes you can use "Ability" instead a noun "Efficacy".

high	high ability	high efficacy
similar	similar ability	similar efficacy
actual	actual ability	actual efficacy
little	little ability	little efficacy
Other adjectives: supernatural, mental, greater, magical.

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.

Source: Tabletop Game / Psionics: The Next Stage in Human Evolution

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Efficacy and Ability. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/ability/efficacy

Ability & Efficacy. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/ability/efficacy>.

Efficacy or Ability. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/ability/efficacy.

Google Ngram Viewer shows how "ability" and "efficacy" have occurred on timeline