The best replacement for nf is nt.

The best alternatives to nf are rated as following:
★★★★★  nt
★★★★  usp
★★★★  pf
★★★  uf
★★★  unf
★★  gs
★  redotex
★  tfm
★  sj
  nl
  bnp
  nc thread
  st
  sf mbti

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Speaking about nf, one probably shouldn't forget about nf.

Other search terms related to nf and their ratings are:
★★★★★ nf
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Google Trends

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nf
nt
usp