Efficacious
Efficacious adjective - Producing or capable of producing a desired result.
Primary and efficacious are semantically related. In some cases you can use "Primary" instead an adjective "Efficacious".
Primary
Primary adjective - Coming before all others in importance.
Efficacious and primary are semantically related. Sometimes you can use "Efficacious" instead an adjective "Primary".
Mutual synonyms
Cite this Source
Primary and Efficacious. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/efficacious/primary
Efficacious & Primary. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/efficacious/primary>.
Primary or Efficacious. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/efficacious/primary.
Google Ngram Viewer shows how "efficacious" and "primary" have occurred on timeline