Significant and Substantial

Significant

Significant adjective - Having great meaning or lasting effect.
Usage example: made a significant change in the procedure for applying for citizenship

Substantial is a synonym for significant in important topic. In some cases you can use "Substantial" instead an adjective "Significant", when it comes to topics like hefty, sizable, sizeable. popular alternative

Substantial

Substantial adjective - Having great meaning or lasting effect.
Usage example: substantial changes to the school dress code that made a lot of people unhappy

Significant is a synonym for substantial in important topic. You can use "Significant" instead an adjective "Substantial", if it concerns topics such as sizeable, considerable, hefty, sizable. popular alternative

Cite this Source
Substantial and Significant. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/significant/substantial
Significant & Substantial. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/significant/substantial>.
Substantial or Significant. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/significant/substantial.
Google Ngram Viewer shows how "significant" and "substantial" have occurred on timeline