Star

It is usual for horses to have white roundish "star" shapes on their face, set high, between the eyes.

                         Stripe

Horses often have thin white lines running from the forehead to the muzzle. Stripes often connect with stars, as here. (The area where the star would be is wider on the stripe.)

                                Snip

A snip is a white spot on the muzzle, between the nostrils.

                    Interrupted Stripe

A stripe can also be "interrupted", by having a star, a short stripe in the middle of the face, and a snip.

                               Blaze

A blaze is just a wide stripe.

                          White Face

If all of the area from the forehead, passing through the eyes, end ending at the muzzle, is white, the horse is said to have a "white face".

                        Sock

If half of a horse's lower leg (cannon bone) is white, the horse has a "sock."

                           Stocking

If all of a horse's lower leg (cannon bone) is white, the horse has a "stocking."

                           Coronet

If a horse has some white hair just above the hoof, the horse has a coronet.