noun
performer; executor; practitioner
Refers to a person who carries out an action, plan, or task. Often used in contexts like project execution, legal enforcement, or implementing a method.
プロジェクトの実行者として、彼は全責任を負った。
As the executor of the project, he took full responsibility.
新しい教育法の実行者たちが集まって意見交換をした。
The practitioners of the new teaching method gathered and exchanged opinions.
実施者 also means a person who carries out something, but 実行者 often implies a more active or responsible role in execution.
Compound of 実行 (execution) + 者 (person). The reading is the standard on'yomi combination.