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a rioter
rioter 是可数名词，泛指单个暴徒时用 a/an。
A rioter threw a stone at the police.
一名暴徒向警察扔了一块石头。
暴徒；骚乱者；暴动者
rioters — plural of rioter
先理解核心含义，再看它在真实句子里的用法。
暴徒；骚乱者；暴动者
a person who takes part in a violent public disturbance or rises up against authority
A rioter threw a stone at the police.
一名暴徒向警察扔了一块石头。
暴乱者；参与制造暴乱的骚乱人群中的一员
One who riots; part of the unruly violent crowd causing a riot.
The police arrested the rioter after he threw a bottle at a shop window.
警察在他向商店橱窗扔瓶子后逮捕了那个暴徒。
A group of rioters gathered in the square and shouted angrily.
一群暴徒聚集在广场上愤怒地呼喊。
The store owner watched the rioters from behind the locked door.
店主从锁着的门后看着那些骚乱者。
rioter 是可数名词，泛指单个暴徒时用 a/an。
A rioter threw a stone at the police.
一名暴徒向警察扔了一块石头。
定冠词 the 用于特指对话双方已知的那群暴徒。
The police arrested the rioters.
警察逮捕了那些暴徒。
用 who 引导定语从句说明是哪类暴徒，词典释义中也使用了这一结构。
Rioters who set fires will be prosecuted.
纵火的暴徒将被起诉。
Not this
The angry students rioter in front of the city hall.
Use this
The angry students riot in front of the city hall.
rioter 是名词，意为“暴徒、骚乱者”，不能作动词。表示“进行骚乱、闹事”应使用动词 riot。主语 students 为复数，动词用原形 riot。
Not this
The police arrested three riots during the demonstration.
Use this
The police arrested three rioters during the demonstration.
riot 指“骚乱事件”或“暴动”，rioter 指参与骚乱的人。“逮捕”的对象是人，所以要用 rioter，而不能用 riot。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
暴力骚乱者
Police used tear gas to disperse violent rioters.
警察使用催泪瓦斯驱散暴力骚乱者。
蒙面暴徒
Masked rioters threw stones at the police.
蒙面暴徒向警察投掷石块。
一群暴徒
A mob of rioters looted shops along the main street.
一群暴徒洗劫了主街上的商店。
与暴徒发生冲突
The security forces clashed with rioters near the government building.
安全部队在政府大楼附近与暴徒发生冲突。
逮捕暴徒
Police arrested the rioters before dawn.
警方在黎明前逮捕了暴徒。
Use rioters naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
想象 riot（骚乱）现场，带头闹事的 -er（人）就是 rioter（暴徒）。
语域：neutral 常见场景：新闻报道、法律文书、官方声明 rioter 是中性偏正式的用词，多用于新闻报道、法律语境和官方声明中，指参与骚乱或暴动的人；日常口语中较少使用。
指参与暴乱的人，通常含贬义。
Dictionary facts from ECDICT, WIKTIONARY.