The word "powderman" typically refers to someone who works with explosives or gunpowder. Depending on the context, there may be a few different synonyms that could be used to describe this type of person. One possibility is "demolition expert" or "blaster," which both convey the idea of someone who specializes in using explosives to bring down buildings or other structures. Other options might include "pyrotechnician" or "explosives handler," both of which suggest a level of expertise and training in dealing with volatile materials. Ultimately, the choice of synonym may depend on the specific job or task being performed by the individual in question.