The term 'SOUND FROM A HORSE' can be broken down into three crossword solutions: NEIGH (5 letters), WHINNY (6 letters), and SNORT (5 letters). A NEIGH is a sound made by a horse, usually in response to another horse or person. A WHINNY is a high-pitched sound made by a horse, often when it is excited or happy. A SNORT is a loud, explosive sound made by a horse, usually when it is startled or angry. All of these sounds are common vocalizations made by horses.