The term 'STABLE NEWBIE' refers to a person who is new to the world of horse care and management. The crossword solutions for this term are COLT (4 letters) and FOAL (4 letters). A COLT is a young male horse, usually between one and four years old, while a FOAL is a young horse of either gender, typically under one year old. Together, these two terms refer to the two stages of a horse's life that a stable newbie would be most likely to encounter.