Scrum, flanker, prop, and full-back are words used in which sport?

There is a saying: “Soccer is a game of the gentleman, played by the hooligans. while Rugby is the game of the hooligans played by the gentleman” I wish I had at least half of the opportunities that Great Britan’s children had when I was a kid. I could become a great number nine in position. I can't return back time, now I have to deal with the Russian dirty corrupted period in my forties. That's sad!