Efficacy and Strength

Similar meaning words

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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Strength is a synonym for efficacy in property topic. In some cases you can use "Strength" instead a noun "Efficacy", when it comes to topics like effectiveness, efficiency.

Strength noun - The ability to exert effort for the accomplishment of a task.

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Efficacy is a synonym for strength in intensity topic. You can use "Efficacy" instead a noun "Strength", if it concerns topics such as property, potency, cogency.

high	high efficacy	high strength
similar	similar efficacy	similar strength
actual	actual efficacy	actual strength
supernatural	supernatural efficacy	supernatural strength
Other adjectives: mental, significant, greater, magical.

Superpower Lottery: Strength and efficacy of unusual abilities in "Phase Two" animals is all over the map, from vultures that upchuck partially-digested remains (which is a Real Life vulture defensive behavior, hence not really a "power" at all) to jellyfish that cause hurricanes.

Source: Series / Zoo
Efficacy measures the strength of an effect, so drugs with the same efficacy will do the same maximum amount of whatever they do.

Source: Polish The Turd
It should also be mentioned that wielding a typical cast iron skillet for any length of time, with any efficacy, would take considerable arm strength.

Source: Frying Pan of Doom

Cite this Source

Strength and Efficacy. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/efficacy/strength

Efficacy & Strength. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/efficacy/strength>.

Strength or Efficacy. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/efficacy/strength.

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