General synonyms:
* Vapor: This is the most common synonym for steam.
* Mist: This term is often used for steam that is very fine and close to the ground.
* Fog: Similar to mist, but usually thicker and more widespread.
* Exhalation: This word emphasizes the process of releasing steam from something.
* Effervescence: This is a more formal term for steam that is bubbling up from a liquid.
More specific synonyms:
* Water vapor: This emphasizes the chemical composition of steam.
* Condensation: This describes the process of steam forming from water vapor.
* Ebullition: This refers to the boiling and steaming of a liquid.
* Fume: This is often used for steam that is accompanied by a strong smell or chemical reaction.
The best word to use will depend on the specific situation and the intended meaning.