To cast a spell:
* Sortilège (formal) - This word implies magic or sorcery.
* Charme (more informal) - This word suggests a charm or enchantment.
* Envoûter (verb) - This means "to cast a spell on someone".
To spell a word:
* Épeler (verb) - This means "to spell" a word.
To spell (as in a period of time):
* Période (noun) - This means "period" of time.
* Durée (noun) - This means "duration" of time.
For example:
* "The witch cast a powerful sortilège." (The witch cast a powerful spell.)
* "Can you épeler your name?" (Can you spell your name?)
* "He spent a long période in prison." (He spent a long period in prison.)
Let me know if you'd like to know more about any of these words!