War machine is a term used to describe weapons or vehicles designed for use in war. However, there are several other words that can be used as synonyms for this phrase. One of these is 'battlefield machinery', which refers to the instruments of war that are used in battle. Another synonym is 'combat equipment', which encompasses all the various gadgets, weapons, and gear used by soldiers in the field. 'Military hardware' is another term that is often employed to describe advanced military technology and weaponry. Lastly, 'war arsenal' refers to the full range of weapons and equipment available to a military force to fight and win a war.