There are many synonyms for the term "good deed" which can be used interchangeably depending on the context of the sentence. Some of the commonly used synonyms for good deed include act of kindness, benevolent act, charitable act, philanthropic act, gracious act, altruistic act, selfless act, compassionate act, humanitarian act, and noble act. The use of different synonyms adds more flavor to a sentence, thereby making it more engaging and interesting. It also helps to avoid repetition of words while conveying the same message. Regardless of which synonym is used, the message remains the same, which is the act of doing something good for someone else without expecting anything in return.