When talking about becoming a donor, there are various synonyms that you may use to convey the same message. For instance, you may say "registered as a donor," "pledged to donate," or "committed to donation." Other options include "enlisted as a donor," "signed up to donate," or "agreed to be a donor." These synonyms are useful in situations that require alternatives to the traditional "became a donor." They can help you to express your intentions to donate more explicitly and add some diversity to your language use. Ultimately, no matter what phrase or term you use, becoming a donor is a generous and selfless act that can make a difference in someone's life.