20 science process words. These can be featured as a word of the week, used to create a word wall or put to use in any other way to allow your students to talk like a scientist. Each word is on a separate sheet of paper with a definition and picture. All pictures are from clker.com Free Clip Art. Words include: Inquiry, Hypothesis, Conclusion, Variable, Explain, Apply, Infer, Compare, Contrast, Classify, Controlled Investigation, Summarize, Observation, Independent Variable, Dependent Variable, Procedure, Analyze, Relationship, Investigation and Evidence.