The best replacement for questionnaire is survey.

The best alternatives to questionnaire are rated as following:
★★★★★  survey
★★★★  interview
★  survey difference
★  questionnaire
★  questionaire
★  focus group
  an interview
  interview difference
  par-q
  survey sample
  in depth interview
  interviews

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Google Trends

Scale is based on the average worldwide traffic of questionnaire in all years. Click on graph for more.
questionnaire
survey
interview