You can refer to a person or organization that gives or supplies a particular thing as a giver of that thing.
例句
Germany is the largest giver of aid among the wealthy countries of the West.德国是西方富裕国家中给予援助最多的国家。...a complex social ritual that says a lot about both the giver and the receiver.关于捐赠者与受援者的复杂的社会礼仪
英英词典释义
Noun
1. someone who devotes himself completely;
"there are no greater givers than those who give themselves"