There are many synonyms for the term "deadly weapons". Some of the most common include "lethal arms", "fatal instruments", "dangerous tools", and "harmful devices". Other options might include "life-threatening gear", "murderous artillery", "destructive weaponry", and "killing machines". There are also more specific terms that can be used to describe certain types of deadly weapons, such as "guns", "knives", "bombs", "poisons", and "explosives". In any case, it is important to remember that the use of deadly weapons can have serious consequences, and should be approached with caution and responsibility.