General synonyms:
* Appease: To pacify or satisfy by giving what is wanted.
* Soothe: To calm or make peaceful.
* Mollify: To make someone less angry or upset.
* Conciliate: To win over someone who is angry or upset.
* Pacify: To make someone calm and peaceful.
* Assuage: To make a feeling less intense.
* Propitiate: To appease a god or other powerful being.
More specific synonyms:
* Satisfy: To meet someone's needs or desires.
* Gratify: To give someone pleasure or satisfaction.
* Please: To make someone happy or content.
* Calm: To make someone less anxious or agitated.
* Settle: To resolve a dispute or conflict.
* Reconcile: To restore harmony or friendship.
The best synonym to use will depend on the specific situation and the nuance you want to convey.