rewarder
/rɪˈwɔːdə/noun
A person who rewards another person or thing; one who requites another. Frequently (especially in early use) with reference to God.
Origin
Late Middle English; earliest use found in The Wycliffite Bible (early version). From reward + -er. Compare Anglo-Norman rewarder, rewardour someone who rewards or recompenses, and also rewarder, rewardour, variants of regardour.