donor

nouns

person who makes a gift of property
bestower, conferrer, donor, giver, presenter
(medicine) someone who gives blood or tissue or an organ to be used in another person (the host)
donor
domain category
the branches of medical science that deal with nonsurgical techniques
medical specialty, medicine
is a type of (narrower)
a person who helps people or institutions (especially with financial help)
benefactor, helper