General synonyms:
* Grit: Determined courage in the face of adversity.
* Guts: Courage and determination, especially in a difficult situation.
* Spunk: Lively spirit and determination.
* Mettle: Courage and strength of character.
* Fortitude: Strength of mind that allows one to endure pain or adversity.
* Resilience: The ability to recover quickly from difficulties.
* Tenacity: The quality of being persistent and refusing to give up.
* Backbone: Inner strength and determination.
More specific synonyms:
* Audacity: Boldness and daring, often with a hint of impudence.
* Bravado: A bold or swaggering display of confidence.
* Chutzpah: Boldness and self-assurance, often bordering on arrogance.
* Drive: A strong desire or ambition to succeed.
* Hustle: Energetic and determined effort to achieve something.
* Verve: Energy and enthusiasm.
The best synonym for "moxie" will depend on the specific context in which you are using it.