The term AQUEDUCT SUPPORT is composed of two words, the first being 'AQUEDUCT' and the second being 'SUPPORT'. The crossword solution for AQUEDUCT is ARCH, which is a four-letter word. An AQUEDUCT is a structure that carries water over a long distance, usually from a higher elevation to a lower one. The SUPPORT for an AQUEDUCT is typically an ARCH, which is a curved structure that is strong enough to bear the weight of the water and other materials that make up the AQUEDUCT.