The German word "Aktion" can be translated into English as "action." However, there are various synonyms that can be used depending on the context. These include "activity," "movement," "operation," "undertaking," "initiative," and "campaign." Each of these words carries a slightly different connotation. For example, "activity" generally refers to a broad range of actions, while "operation" often implies a complex and planned set of actions. "Campaign" usually suggests a focused and organized effort to achieve a specific goal. In any case, using synonyms for "aktion" can help to add depth and nuance to your language, conveying a more precise meaning to your writing or speech.