Response rate refers to the percentage of people who respond to a survey, questionnaire or any other form of communication. There are several synonyms for response rate that are used interchangeably in different contexts. These include reply rate, completion rate, return rate, feedback rate, participation rate, and survey response rate. The use of these synonyms depends on the nature of the communication and the type of audience. For instance, reply rate may be used for emails, while participation rate may be used for events or online activities. Regardless of the synonym used, response rates are important in evaluating the effectiveness of communication and gathering valuable feedback.