協力者

cooperator, collaborator

kʲ o̞ː ɾʲ o̞ k ɯ̟̊ ɕ a̠
協 cooperation; collaboration + 力 force; strength + 者 person who; -er/-ist
noun Rare #38,142
cooperator, collaborator Can refer to someone who helps or cooperates with an enemy, especially in political or wartime contexts.
JA: この計画には協力者が必要です。
EN: We need a collaborator for this plan.

おまえはナチス協力者か?

Are you a Nazi collaborator?

— Брат 2 (2000)

アメリカには協力者も多い

The U.S. also has many supporters.

— 灼熱の魂 (2010)

あなた達二人は立派な協力者になると思います

I think you two would make excellent collaborators.

— レッドクリフ Part I (2008)