The best replacement for note is bond.

The best alternatives to note are rated as following:
★★★★★  bond
★★★★  mortgage
★★★★  tab
★★★  s4
★★★  iphone
★★  loan
★★  notice
★★  ipad
★★  galaxy
★★  notes
★★  notate
★  note 2
★  tab 3
★  mega
★  galaxy s3
★  s3
★  galaxy tab
★  evernote
★  deed of trust
★  samsung galaxy s2
★  pukka
★  bill
  comment
  treasury bill
  nexus
  treasury bond
  unsecured note
  walkman
  deed
  ipad air
  invoice
  galaxy note 2
  ps
  personal guarantee
  interest bearing note
  note 2 specs
  pitch
  detective conan
  reference manager
  federal reserve note
  chord
  memorandum
  galaxy s2
  2do
  debenture
  corporate bond
  gobinder
  promissory note

Your alternative for note is not listed? Suggest!
Speaking about note, one probably shouldn't forget about recourse.

Other search terms related to note and their ratings are:
★★★★★ recourse
★★ deed of trust
★★ pushpin
★ security agreement
paying
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Google Trends

Scale is based on the average worldwide traffic of note in all years. Click on graph for more.
note
bond
mortgage