Same word as network:

arrangement, artery, chain, checkerboard, circuitry, complex, convolution, crisscross, fabric, fiber, grid, grill, grillwork, hookup, interconnections, jungle, labyrinth, maze, mesh, net, netting, nexus, organization, patchwork, plexus, reticulation, reticule, screening, structure, system, tessellation, tracks, wattle, weave, web, wiring