preserver
Definitions
A person or thing that maintains something in its original or existing state.
A device or substance used to keep food or other materials from decaying.
A life preserver or similar safety apparatus designed to keep a person afloat.
Examples
The salt acts as a natural preserver for the fish, allowing it to be stored for long periods.
She considers herself a preserver of local traditions, spending her weekends documenting oral histories.
The life preserver kept him afloat until the rescue boat arrived at the scene.
Synonyms
guardian protector defender savior custodian keeper conservator