Nouns connected with people

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Across
  1. 1. electric (adj), electrical (adj), electrify (v)
  2. 4. cash (n)
  3. 5. buy (v)
  4. 8. machine (n), machinery (n), mechanism (n)
  5. 12. visit (v/n)
  6. 16. library (n)
  7. 17. supervise (v), supervised (adj), supervision (n)
  8. 18. sale (n), salesman (n), saleswoman (n)
  9. 19. sell (v), sold (adj)
Down
  1. 2. law (n)
  2. 3. custom (n)
  3. 6. reception (n)
  4. 7. wait (v), waiter (n)
  5. 9. assist (v), assistance (n)
  6. 10. shop (v/n), shopping (n), shopkeeper (n)
  7. 11. own (v), ownership (n)
  8. 13. hairy (adj), hair (n), haircut (n)
  9. 14. manage(n), managing (adj)
  10. 15. optic (adj), optical (adj)