The best replacement for comprehension is production.

The best alternatives to comprehension are rated as following:
★★★★★  production
★★★★  understanding
★★★  fluency
★★★  educated
★★  collision
★★  educated fallout 3
★  educated new vegas
★  listening comprehension
★  reading comprehension
★  apprehension
★  decoding
  reading
  educated fallout vegas
  inferential comprehension
  memorization
  vocabulary
  reading fluency
  textbook comprehension
  perceptual reasoning
  auditory processing
  production language

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Speaking about comprehension, one probably shouldn't forget about fluency.

Other search terms related to comprehension and their ratings are:
★★★★★ fluency
★★★ multiple choice
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Google Trends

Scale is based on the average worldwide traffic of comprehension in all years. Click on graph for more.
comprehension
production
understanding