3. Electronic Equipment Recyclers (They recycle equipment that electronic)
4. Electronics Equipment Recyclers (They recycle equipment used in electronics)
8. This will improve your system's performance.
9. This is an electronic company. (A company that is electronic)
10. This is an electronics company.(A company that deals in electronics)
13. This is a monstrous engine. (a huge engine)
14. This is a monster engine. (an engine the size of a monster)
15. This is a monster's engine. (the engine belongs to a monster)