The word "armer" typically refers to someone who is armed with weapons or protective gear. Some synonyms for this word include "armed," "equipped," and "fortified." Other related words that could be used in its place include "guarded" or "protected." Additionally, if the context is more militaristic, "soldier" or "trooper" could be used instead. It's important to consider the nuance and connotations of these synonyms when selecting one to use in place of "armer." Ultimately, the choice of synonym will depend on the specific context of the sentence or passage in which it is being used.