Select the INCORRECTLY spelt word.

Exclaimation

The incorrectly spelled word is "Exclaimation." The correct spelling is "Exclamation."

Explanation of all options:

1. Affiliate: Correctly spelled. It refers to a person or organization officially attached to a larger group or organization.

2. Annihilate: Correctly spelled. It means to completely destroy or eliminate something.

3. Exclaimation: Incorrectly spelled. The correct spelling is "Exclamation." It refers to a sudden or emphatic expression of emotion or surprise.

4. Aesthetic: Correctly spelled. It relates to beauty or the appreciation of beauty.