The best replacement for both is each.

The best alternatives to both are rated as following:
★★★★★  each
★★★★  either
★★  both
★★  both of
★★  both of you
★  bolth
★  each grammar
★  both of them
★  either grammar
★  i miss both of you
  both for
  you and i both
  one ear pierced
  thank you both
  there are both
  are both
  for both of you
  both of us
  you and me both
  both in
  they both are

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