Arch
Arch adjective - Coming before all others in importance.
Usage example: since the start of her acting career her parents have steadfastly remained her arch supporters
Collateral is an antonym for arch.
Collateral
Collateral adjective - Accompanying; concomitant.
Arch is an antonym for collateral.
Nearby Word: collate
Cite this Source
Collateral and Arch. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/arch/collateral
Arch & Collateral. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/arch/collateral>.
Collateral or Arch. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/arch/collateral.
Google Ngram Viewer shows how "arch" and "collateral" have occurred on timeline