Experiment mean to me that we try things about what we are learning about. If we made something, we see if it works.
Energy means to me that energy is something we have especially when we are in P.E or playing sports. Energy is also what give us power to do stuff.
This is for energy- www.merriam-webster.com/dictionary/energy
This is for experiment- www.merriam-webster.com/dictionary/experiment