The term TRY is used in Rugby League and Union this is when a player puts down the ball on the try. A try is worth 4 point in league and 5 points in Union.
Touchdown is used in NFL, this is when a player is in the touch-down region of the field, and he can basically walk though it.
Extra point is a field goal which is worth one point. This is used in all three games.
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It's called a try and you get 5 points for it and are given a conversion, which is a free shot at the goal. If you score that then you get 2 more points.