Prefix co- and con-

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Across
  1. 2. Incidences that happen together or at the same time
  2. 5. Talking with people
  3. 6. A person that someone works with
  4. 7. Exist together
  5. 9. Gather things together
  6. 10. Build things by putting them together
  7. 11. Flatten by pressing together
Down
  1. 1. A place where students learn together
  2. 3. Operate with another person
  3. 4. Having a conflict with someone
  4. 7. When people or cars bump into each other or come together
  5. 8. Putting multiple things together