Benefactor
Part of speech: noun
Definition: Somebody who gives one a gift (normally refers to a person who gives to a charity).
Example sentence: I started working in an STD phone booth where I had to note down all the numbers that were dialed - this was post 9/11 when security was a looming issue. I got Rs 10 per day for my work. Soon after, a benefactor offered me a job in a cybercafe down the road for Rs 20.
Helper
Part of speech: noun
Definition: One who helps; an aide.
Example sentence: He that struggles with us strengthens our nerves, and sharpens our skill. Our antagonist is our helper.