Antonyms for the word "out posts" would include "main headquarters," "central location," or "home base." These terms refer to the main office or location where most of the work and decision making takes place. While outposts may be smaller, temporary locations used for specific tasks or missions, main headquarters are permanent and serve as the main point of operation. Additionally, outposts may be more isolated or located in remote areas, while main headquarters are typically located in more populated or accessible areas. Whether referring to military operations, business operations, or any other type of organization, understanding the difference between outposts and their antonyms can help clarify the structure and hierarchy of the group.