K

                                                            key (n)

                                                             

The key is very big.

http://billramseyrealtors.com/wp-content/uploads/2012/09/Key-Success.jpg

keyboard (n)

The keyboard is black.

http://upload.wikimedia.org/wikipedia/commons/f/f0/Bijoy_Keyboard_image.jpg

kite (n)

The kite has got many colours.

http://www.skyhighkites.co.uk/product_images/l_64_1.jpg