The word "Citizen"
Training
I rarely use it, and if I do I define it emphatically (i.e., make it crystal clear this is not about immigration but membership). Generally I find among grass roots audiences the word can trigger or is not well understood. I find that those who get it most tend to be the most educated and bookish in my audiences (I say that as a voracious reader on such topics). I just don't find the need.