Contribution
Part of speech: noun
Definition: Something given or offered that adds to a larger whole. An amount of money given toward something. The act of contributing.
Example sentence: I hope to make a positive, productive contribution, as cheesy as that may sound.
Donation
Part of speech: noun
Definition: A voluntary gift or contribution for a specific cause.
Example sentence: I've been involved with blood donation since the 1980s because there is a critical need.