Many of those words aren’t actually limited to those use cases, but they are used there because they have very specific meanings. 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.
Others are just expressions. A snap election is just when you call an election earlier than the scheduled one. It’s essentially a nickname for something more complicated. Same goes with casting a ballot. It just means to toss your vote in for the count. It’s just the expression that stuck because it sounds fancier than just saying “voting.”
Also tourism shows that the middle class elsewhere can afford to travel. You don’t hear people complain about Indonesian tourists in Europe, for example. But Bali on tge other hand is truly suffering the consequences of Western tourism.