The antonyms for the word "cross bars" are "open space," "empty area," and "freedom of movement." These words are opposite in meaning to "cross bars," which refers to bars or beams that intersect or cross each other, thus forming a rigid structure. Therefore, open space, empty area, and freedom of movement imply the absence of any obstructing object, such as cross bars. In the context of architecture and construction, buildings designed with open space arrangements and without cross bars offer an uncluttered and free-flowing environment, allowing for a more natural movement of people and objects.