Identify the misspelt word:

The correct option containing the misspelt word is Privillage.

Let's examine each of the given options to check their spelling and meaning:

1. Perseverance: This word is spelt correctly. It means persistence in doing something despite difficulty or delay in achieving success.

2. Supersede: This word is spelt correctly. It means to take the place of a person or thing previously in authority or use.

3. Privillage: This word is incorrectly spelt. The correct spelling is Privilege (with an 'e' instead of the second 'a'). It refers to a special right, advantage, or immunity granted or available only to a particular person or group.

4. Mischievous: This word is spelt correctly. It describes causing or showing a fondness for causing trouble in a playful way.

Therefore, the misspelt word among the choices is Privillage.