The term 'Horse Feed Supporter' can be summarized by the crossword solution 'Nosebag', which is a seven letter word. A nosebag is a type of bag that is used to feed horses, typically filled with hay or grain. It is usually hung around the horse's neck and is supported by straps that go over the horse's head. The nosebag is an essential tool for horse owners, as it allows them to easily provide their horses with food while they are out in the field or on the trail.