ensurer

noun

en·​sur·​er

-u̇rə(r)

plural ensurers

: something or someone that makes something sure or certain : one that ensures something

an ensurer of success

The birthstone for December is turquoise, which has long been regarded as a protective stone, a bringer of good fortune and ensurer of good health.

—News-Sun (Sebring, Florida), 8 Dec. 2013

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