Question

what is a difference between coined and discovered

Answer 1

A discovery is recognizing something that already exists for the first time, that nobody has found before,. An invention is creating something totally new with one's own ideas and development.

Answer 2

discovery is finding/recognizing something which is already present.
eg: Christopher Columbus discovered America
coined is term given to something which is invented
eg: the Wright brothers invented the first aeroplane and coined it Kitty Hawk flight