A buckskin is a black horse, plus agouti (makes it bay), plus one cream (makes it dilute to buckskin).
There are several shades of Buckskin, this horse is one of them. They can range from being very light, like this one, to being very dark.
There is such thing as a White horse. But there is no such thing as an Albino horse, which I take it, is what you meant.