I can’t find anything in the help section that shows how to get rid of word picture for open-ended questions.
In the REPORT editor, click on OPTIONS in the left sidebar menu. Open the QUESTION ELEMENTS tab and toggle off the CHARTS option. Unfortunately this will turn off all of the other charts (pie charts, bar charts, etc.) that are appear on your report. Depending on the questions within your survey, the SUMMARY TABLEs may be a suitable alternative to the charts.