The best replacement for latter is later.

The best alternatives to latter are rated as following:
★★★★★  later
★★★★  former
★★★★  ladder
★★  former definition
★  last
★  prior
★  former grammar
  former meaning
  former example
  latter
  previous

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Speaking about latter, one probably shouldn't forget about former.

Other search terms related to latter and their ratings are:
★★★★★ former
★★★ neglecting the former
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Google Trends

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latter
later
former