structure vs defensive structure

Other hyponyms of structure include airdock, hangar, repair shed, altar, arcade, colonnade, arch, area, balcony, balcony, bascule, boarding, body, bridge, span, building, edifice, building complex, complex, catchment, coil, helix, spiral, volute, whorl, colonnade, column, pillar, corner, quoin, cross, deathtrap, defence, defense, door, entablature, erection, establishment, false bottom, floor, level, storey, story, fountain, guide, card-house, cardcastle, cardhouse, house of cards, housing, living accommodations, lodging, hull, jungle gym, lamination, landing, landing place, lookout, lookout station, observation tower, observatory, masonry, memorial, monument, hill, mound, impediment, impedimenta, obstructer, obstruction, obstructor, divider, partition, platform, weapons platform, porch, post and lintel, prefab, projection, public works, sail, offset, set-back, setoff, shelter, shoebox, sign, signboard, arena, bowl, sports stadium, stadium, superstructure, supporting structure, tower, transept, trestlework, vaulting, shipway, slipway, ways, wellhead, wind tunnel, honeycomb, balance, counterbalance, equilibrium, equipoise.