command module(n = noun.artifact) - a space module in which astronauts can live and control the spacecraft and communicate with earth;
is a kind of module

air combat command, air force space command, allied command atlantic, allied command europe, command, command guidance, command key, command language, command line, command line interface, command of language, command overhead, command post, command processing overhead, command processing overhead time, command prompt, criminal investigation command, high command, lunar excursion module, lunar module, module, power module, system command