The antonyms for the word "closed at one end" would be "open at one end" or "open-ended." An object or container that is open at one end allows free movement of air, substances, or objects in and out of it. Examples of open-ended containers are tubes, pipes, tunnels, and funnels. Unlike closed-ended containers, open-ended ones allow for fluidity and flexibility, making them suitable for various purposes. Open-ended objects are also more versatile, enabling users to modify, shape, or extend them to fit a specific task or function. In summary, the antonym for "closed at one end" is "open at one end," which offers a more flexible and adaptable design for various applications.