Select the INCORRECTLY spelt word.

Appetising 

The incorrectly spelled word is Appetising. The correct spelling is Appetizing.

• Diffusion is the spreading of something out over a wider area.
• Substitution is the act of replacing one thing with another.
• Propeller is a device that rotates to move an object through the air or water.
• Appetizing is something that makes you want to eat it.