In model rockets, the only part that is discarded is the actual motor casing. Everything else is re-usable provided it lands in good shape.
control
Booster stage
Discard is a verb.
The Space Shuttle's orbiters were designed to be reused for multiple missions. After each flight, the orbiter would undergo refurbishment and upgrades to prepare for its next mission. The solid rocket boosters and external fuel tank were not reusable and were discarded after each launch.
No part of the Saturn V rocket was reusable.
The stem of the rivet is discarded. It is pulled in to the rivet gun and breaks off at a cetain point.
The back part of a rocket is called the rocket nozzle. It is responsible for directing the flow of exhaust gases to generate thrust and propel the rocket forward.
The part of the rocket where the flames come out is called the rocket engine or rocket nozzle. This is where the fuel and oxidizer mix and ignite to produce thrust that propels the rocket through the atmosphere or space.
The payload, which is the actual payload, is the part of the rocket that reaches space.
The top part of a rocket is called the payload. This is the section of the rocket that carries the satellite or other cargo that is being launched into space.
The bottom part of a rocket is called the "rocket stage" or "first stage." This part contains the engines and fuel necessary for liftoff and initial ascent. After its fuel is expended, it typically separates from the rest of the rocket to reduce weight for the subsequent stages.
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