Brain Teasers and Puzzles

A box for your workings out:

Hint: You might need an old calculator.

Answer: Coil.

This is the only word which cannot be spelled using a calculator.

For example, enter 376616 into an old-fashioned calculator and look at the number upside down, you can read giggle.

The other words can be spelled using, 7105, 57738, 4506, 3704 and 5355378.