A pillar is a vertical structure that is used to SUPPORT a building or other structure. The crossword solutions for the term 'pillar' include PEDESTAL (8 letters), PILASTER (8 letters), PROP (4 letters), MAST (4 letters), SUPPORT (7 letters), UPRIGHT (7 letters), SHAFT (5 letters), stele (5 letters), PIER (4 letters), OBELISK (7 letters), MAINSTAY (8 letters), COLUMN (6 letters), POST (4 letters), and stela (5 letters). PEDESTAL, PILASTER, and COLUMN are all architectural elements that are used to SUPPORT a structure, while PROP, MAST, SUPPORT, UPRIGHT, SHAFT, and POST are all terms used to describe a vertical structure that provides SUPPORT. Stele, PIER, OBELISK, and stela are all types of monuments that are typically tall and slender in shape. Finally, MAINSTAY is a term used to describe something that is essential or important in providing SUPPORT.