叹词

noun

interjection; exclamation; word expressing strong emotion, greeting, or response

A grammatical category of words that express sudden emotions (surprise, joy, pain, anger, etc.) or serve as greetings and responses. These words typically do not enter into grammatical relationships with other words in a sentence. Common examples include 啊 (ah), 哎 (hey), 哟 (oh), 哼 (humph), 嗯 (mhm), and 喂 (hello).