A colonnade is a series of columns that are connected and often used to support a roof or archway. The term can also refer to a long gallery with a roof supported by columns. STOA (4 letters) is an ancient Greek term for a covered walkway, ARCADE (6 letters) is a series of arches supported by columns, PORTICO (7 letters) is a porch-like structure with a roof supported by columns, ELM (3 letters) is a type of tree, peristyle (9 letters) is a courtyard surrounded by a colonnade, elms (4 letters) is the plural form of ELM, apteral (7 letters) is a colonnade without a roof, and CLOISTER (8 letters) is a covered walkway with a roof supported by columns.