The best replacement for taught is thought.

The best alternatives to taught are rated as following:
★★★★★  thought
★★★  tight
★★★  tought
★★★  taut
★★  teached
★★  research masters
★★  taught
★★  caught
★  formal education
★  teach
★  learnt
★  learned
★  learn
★  tort
★  research postgraduate
★  research degree
  lessons guitar
  self learned

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