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A plaintiff, for example, is the person lodging a complaint. Doesn’t have to be a legal complaint, but in legal terms it makes it very clear who we’re talking about.
I think the OP was wondering why that person wouldn’t just be called a complaintlodger. Like with firefighter.
I believe there’s a whole section of one of the books devoted to the in world-calendars and their relation to the Gregorian one.