ject = throw

dejected (adj) to feel sad; to feel thrown down in spirit

eject (v) to throw out

injection (n) a shot; the “throwing” of medicine into the body by a needle

interjection (n) a word thrown into or between a sentence or conversation

jettison (v) to throw goods overboard to lighten the load on a boat or an airplane

projectile (n) an object thrown into the air with great force

projector (n) a machine that throws an image onto a wall

reject (v) to throw something out because it’s defective and can’t be used again

subject (v) to throw oneself under someone else’s rule

trajectory (n) the curved path of an object thrown into space