• 協力きょうりょく — cooperation
• 協会きょうかい — association, organization
• 協議きょうぎ — discussion, negotiation
• 協定きょうてい — agreement, pact
• 協同きょうどう — collaboration, joint effort
• 協商きょうしょう — diplomatic talks

The kanji 協 combines elements implying strength and union. It symbolizes combining power or intentions — ten people putting their thoughts or energy together. It’s used in many modern compound words that involve cooperation or group effort.

皆みなで 協力きょうりょくして 準備じゅんびしました。
We all worked together to prepare.

国際こくさい協定きょうていが 結むすばれました。
An international agreement was signed.

協議きょうぎの結果けっかを 発表はっぴょうします。
We will announce the results of the discussion.

🎧 “キョウ” is the standard on-yomi and is used in all compound forms like 協力 and 協会. This kanji does not have a commonly used kun-yomi today.