When it comes to addressing complaints, there are various synonyms you can use instead of "answer to complaint". Some of these options include: 1. Response: This word implies that you're providing a reply to the complaint that has been lodged. 2. Resolution: This word suggests that you're providing a way to solve the issue that led to the complaint in the first place. 3. Reply: This word simply means that you're responding to the complaint in some way. 4. Feedback: This word can be used when you're giving input on the complaint or offering advice on how to avoid similar issues in the future. 5. Action: This word emphasizes that you're taking steps to address the complaint and make things right for the person who lodged it.