For temperature:
* Congeal: This emphasizes the process of becoming solid.
* Solidify: Similar to congeal, but can also be used for non-liquid substances.
* Chill: Indicates a lower temperature, but not necessarily freezing.
* Glaciate: Specifically refers to becoming covered in ice or turning into a glacier.
For action:
* Stop: General term for halting movement or activity.
* Halt: Similar to stop, but often implies a sudden or abrupt end.
* Stalemate: Indicates a situation where progress is impossible.
* Immobilize: To make something unable to move.
* Paralyze: To render someone or something incapable of action.
For figurative uses:
* Cease: To stop something completely.
* Suspend: To temporarily stop something.
* Stagnate: To become inactive or stagnant.
* Crystallize: To become fixed or definite.
The best synonym for "freeze" will depend on the specific situation and the nuance you want to convey.