"My word is my bond" is a powerful phrase that emphasizes the importance of keeping one's promises. However, there are many other synonyms and phrases that can be used to convey a similar sentiment. For instance, "I give you my word" is a popular expression that means the same thing. "I swear on my honor" is another phrase that denotes a strong commitment to keeping one's word. "I pledge" and "I vow" are also good alternatives. Ultimately, it's all about showing integrity and trustworthiness, regardless of which phrase or synonym is used. Keeping one's word is key to building strong relationships and forging a good reputation.