Appendix 6 in the Evidence Analysis Manual from the Academy of Nutrition and Dietetics provides a glossary of different research design terms.
Use "Figure 2.2 Algorithm for Classifying the Research Design of Primary Studies" (pg 33) in the Evidence Analysis Manual to help think through different questions and find the closest description for study design. There are also instructions after the figure that explain how to use this algorithm.
Not all studies are created equal.
Use the following Hierarchy & Classification of Studies from the Academy of Nutrition and Dietetics' Evidence Analysis Manual to help you find the best evidence, not just the first results.
“Evidence Pyramid” by Tufts University can be reused under the BY-NC-SA license 4.0