the.com/benefactor
Someone who funds your dreams and gets the building named after them.
means A person who gives money, support, or kindness to someone in need or to a cause.
from From Latin bene (well) plus facere (to do) — literally a well-doer, one who does good with their means.
OppositeA malefactor does evil instead of good.
BeneficiaryDifferent word: the one who receives the good.
Anonymous varietyGives without demanding a plaque.