For physical movements:
* Motion: This is the most general term, referring to any physical movement.
* Sign: This implies a specific movement used to communicate something.
* Signal: Similar to "sign," but often implies a more deliberate or formal communication.
* Action: This emphasizes the intention behind the movement.
* Deed: This implies a significant or meaningful action.
For acts of kindness or goodwill:
* Courtesy: This suggests a polite or considerate action.
* Favor: This implies something done to help someone.
* Kindness: This emphasizes a caring or compassionate action.
* Generosity: This highlights the giving nature of the act.
* Thoughtfulness: This emphasizes the intention behind the act.
For symbolic actions:
* Symbol: This refers to something that represents something else.
* Token: This suggests a small but meaningful gesture.
* Expression: This emphasizes the emotional or communicative aspect.
* Act: This is a general term that can refer to any symbolic action.
The best synonym will depend on the specific context in which you are using the word "gesture."