The best replacement for concepts is constructs.

The best alternatives to concepts are rated as following:
★★★★★  constructs
★★★★  variables
★★★  selling concepts
★★  ideas
★★  skills
★  theories
★  facts
★  original jeet kune do
★  original jkd
  matrix reasoning
  principles
  topics
  themes
  functional concepts
  terms
  processes
  concrete concepts
  natural concepts

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Speaking about concepts, one probably shouldn't forget about precepts.

Other search terms related to concepts and their ratings are:
★★★★★ precepts
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