preserver

noun

1. One who preserves.

   “Like lightning Numa turned upon this new enemy, and, defenseless as he was, Tarzan of the Apes was nearer to death that instant than he ever before had been. It was the black who saved him. The warrior realized in an instant that he owed his life to this strange white man, and he also saw that only a miracle could save his preserver from those fierce yellow fangs that had been so near to his own flesh.”

2. A life preserver.
3. A person who refinishes furniture.
4. A person who prepares preserves of fruit or preserved meats.