When it comes to synonyms for the word "co-piers", there are quite a few options to consider. One possible term is "co-workers," which refers to individuals who work alongside each other in a professional setting. Another similar phrase is "colleagues," which also implies a sense of professional connection and shared goals. "Teammates" is another possible synonym, focused more on individuals who work together on a particular project or goal. Additionally, "associates" and "partners" also carry similar connotations of working alongside others with shared goals and objectives. Ultimately, the choice of synonym depends on the specific context and tone of the conversation or writing.