An interrogative particle is a word or phrase that is used to indicate a question or inquiry. Some common synonyms for this term include question word, interrogative pronoun, and inquiry marker. These words are all used to introduce questions or make inquiries, and they are often used to seek information or clarification. Other synonyms include interrogator, query word, and question marker. These terms all have similar meanings and are often used interchangeably in conversation and writing. By using these synonyms, you can add variety and depth to your language and communicate more effectively with others.