An experiment is a test which somebody does to see what the result will be, or to prove something. Experiment is generally used with the verb do. There is also a verb to experiment.
  • We did an experiment in the chemistry lesson, to see if you could get chlorine gas from salt.
  • I’m experimenting with a new perfume.
An experience is something that you live through; something that happens to you in life. Experience is generally used with the verb have. There is also a verb to experience.
  • I had a lot of interesting experiences during my year in Africa.
  • Have you ever experienced the feeling that you were going crazy?
The uncountable noun experience means “the knowledge that you get from doing things”.
  • Salesperson wanted – experience unnecessary.