The answer to the crossword for the term PART OF A GATEWAY is ARCH. An ARCH is a curved structure that is used as an entrance or passageway. It is often found in architecture, such as in doorways, windows, and bridges. Arches are also used in many other structures, such as aqueducts, tunnels, and even some types of furniture. Arches are a common feature in many styles of architecture, including Gothic, Romanesque, and Baroque.