In the absence of the reaction force a person will sink through the ground. Many amusement park rides generate the weightless sensation by accelerating down at close to 22 mph every second. Weight is the force with which an object is pulled toward the earth by gravity. Weight is the pull of gravity. Typical weight units are pounds and newtons.
Work is the force used to move something in the direction of the force.
If you hold a box, no work is being done on the box. If you drag the box, work is being done. Work is how much you have to push or pull a roller coaster in order to move it for a certain distance. Work is done if a chain, pulled by a motor, pulls the roller coaster up to the top of a hill on the track. It takes work to lift a roller coaster to the top of the first hill in order to overcome the force of gravity.