When the suffix "-ment" is added to the word "enchant", it becomes the noun "enchantment."
### Explanation:
- The suffix "-ment" is used to form nouns that refer to the action or result of an action. In this case, adding "-ment" to "enchant" creates "enchantment", which refers to the state or result of being enchanted or the act of enchanting.
### Example:
- Enchant (verb) → Enchant + -ment = Enchantment (noun), which means the state of being under a magical spell or the act of casting a spell.
So, the word "enchant" becomes the noun "enchantment" when the suffix "-ment" is added.