From The Collaborative International Dictionary of English v.0.48:
Preserver \Pre*serv"er\, n. 1. One who, or that which, preserves, saves, or defends, from destruction, injury, or decay; esp., one who saves the life or character of another. --Shak. [1913 Webster]
2. One who makes preserves of fruit. [1913 Webster]
Game preserver. See under Game. [1913 Webster]