* Spécial: This is the most common and general word for "special." It can be used for something unique, extraordinary, or simply different from the ordinary.
* Exceptionnel: This word implies something exceptional, outstanding, or remarkable.
* Particulier: This word means "particular" or "specific," and can be used to describe something unique or special.
* Extraordinaire: This is a more formal word for "extraordinary," meaning something beyond the ordinary.
* Unique: This word is also used in French, and has the same meaning as in English.
The best word to use depends on the specific situation and the meaning you want to convey.