The term EXPOS is a shortened form of the word exposition, which can refer to a variety of events. FAIRS (5 letters) is an abbreviation for fairs, which are large gatherings of people for entertainment or commercial purposes. TELLALL (7 letters) is a type of exposition that involves revealing information about a certain topic. TRADEFAIRS (10 letters) are expositions that focus on trade and commerce, where businesses and organizations showcase their products and services.