The best replacement for vow is promise.

The best alternatives to vow are rated as following:
★★★★★  promise
★★★  vow3
★★★  oath
★★★  idx
★★★  lucky one
★★  this means war
★★  pledge
★  avow
★  swear
★  safe house
★  50 first dates
★  dear john
★  ubersaw
  make a vow
  true story
  panata
  take a vow
  not to vow

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vow
promise
vow3