Pillars are a type of architectural structure that have been used for centuries to support buildings, monuments, and other structures. The term 'pillars' can refer to a variety of different structures, including ANTAE (5 letters), which are two half-columns that form an entranceway, COLUMNS (7 letters), which are tall, cylindrical structures, and STELAE (6 letters), which are upright stone slabs with inscriptions or carvings.