Penguin Species Word Search

How many smaller words can you make out of the letters in PENGUINS?

Here's a lovely, simple drawing of a penguin for the kids to copy using the grid to help. Colour him in using the picture below as guidance, too, if you like.

The word rooster is hidden in this grid many times; horizontally, vertically and diagonally but never backwards. How many times can your children find it?