Rencounters is a relatively uncommon word, and therefore it can be difficult to think of synonyms to use instead. However, there are a few options. "Encounters" is a more commonly used word that can be substituted in most cases. "Meetings" is another possibility, especially if the focus is more on the location or purpose of the meeting rather than the individuals involved. For a more formal or academic setting, "conjunctures" or "occasions" might be used. If the context involves conflict or opposition, "clashes" or "confrontations" are appropriate substitutions. Ultimately, the best synonym will depend on the specific context and desired tone.