The best replacement for lean is six sigma.

The best alternatives to lean are rated as following:
★★★★★  six sigma
★★★  rich
★★★  agile
★★  bulky
★  bulk
★  classic p90x
★  buff
★  bulky muscle
★  classic
★  scrum
★  rich fuel mixture
★  sizzurp
  lean
  erp
  classic p90x3
  toc
  big
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  scissor
  muscular
  six sigma certification
  p90x classic
  purple drank
  mrp
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  continuous improvement
  dmaic
  ripped
  jit
  kaizen
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  6 sigma
  skinny
  traditional manufacturing
  tps
  bony
  tqm
  mass production

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Speaking about lean, one probably shouldn't forget about six sigma.

Other search terms related to lean and their ratings are:
★★★★★ six sigma
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Google Trends

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lean
six sigma
rich