What are differences between rugby and American football

Rugby and American football are both popular team sports that involve physical contact and a goal of scoring points by advancing the ball down the field. However, there are several key differences between the two sports.

Field size: Rugby is played on a rectangular field that is 100 meters long and 70 meters wide, while American football is played on a field that is 100 yards long and 53 yards wide.
Number of players: Rugby is played with 15 players on each team, while American football is played with 11 players on each team.
Shape of the ball: The rugby ball is oval-shaped, while the American football is prolate spheroid-shaped.
Scoring: In rugby, a try is worth 5 points, a conversion kick is worth 2 points, and a penalty kick is worth 3 points. In American football, a touchdown is worth 6 points, an extra point kick is worth 1 point, and a field goal is worth 3 points.
Tackling: In rugby, players can tackle opponents above or below the waist, while in American football, players can only tackle opponents below the waist.
Passing: In rugby, players can pass the ball backward or to the side, while in American football, players can only pass the ball forward.
Kicking: In rugby, players can kick the ball at any time, while in American football, players can only kick the ball on certain downs.

Related questions:

What is the size of a rugby field? A: 100 meters long and 70 meters wide.
How many players are on each team in American football? A: 11.
What is the shape of the rugby ball? A: Oval-shaped.
How many points is a try worth in rugby? A: 5.
What is the only way to advance the ball forward in American football? A: Passing.

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What are differences between rugby and American football?