The best replacement for cannot is can not.

The best alternatives to cannot are rated as following:
★★★★★  can not
★★★★  can't
★★★  could not
★★  can not grammar
★★  may not
★★  will not
★  do not
★  cannot
★  can not ap style
★  must not
  can no
  can not which is correct
  can
  i can not
  can not british english
  should not
  shall not
  not

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