Correct spelling, explanation: the word noisy is an adjective, which means it’s a derivative of a noun or a verb. In this case, the root is the noun noise. It seems natural to just add a suffix to the basis, but we have to remember one rule: if the noun has the letter -e in the ending, this letter must be removed and replaced by the -y suffix. The right spelling is noisy, not noisey.

Definition of noisy:
adjective, full of loud or unpleasant noise
Maria wants to meet us in a small, but noisy cafeteria.
What do you think about noisy places?

Incorrect spelling, explanation: this mistake may occur, because many English users tend to forget that the -e letter disappears from the word noise when we add the -y suffix to it. We must remove this vowel while creating an adjective, so the letter -e wouldn’t be next to the letter -y. That’s why the only right spelling is noisy, not noisey.

Incorrect spelling

Incorrect spelling

Incorrect spelling

Incorrect spelling