At times we might need to use a different word for "rifter," which is a person who causes division or disunity among others. One possible synonym is "divider," which conveys the same meaning. Another option is "discord sower," which is a more descriptive and vivid term. Additionally, we can use "agitator" to suggest that this person actively promotes conflict or unrest. Another term that might apply is "troublemaker," which implies that the person causes problems and tensions. Finally, we can use "disrupter" as a somewhat neutral label for someone who upsets group dynamics or disturbs the status quo.