Philanthropist
Part of speech: noun
Definition: A person who loves mankind (the human race) in general. A very generous person or institution.
Example sentence: Philanthropy is commendable, but it must not cause the philanthropist to overlook the circumstances of economic injustice which make philanthropy necessary.
Altruist
Part of speech: noun
Definition: One imbued with altruism; one who wishes well for others, not themselves.