More formal:
* Investigation: This implies a more systematic and thorough examination of a phenomenon.
* Study: Similar to investigation, this suggests a focused analysis of a specific topic.
* Trial: This emphasizes the testing of a specific hypothesis or idea.
* Procedure: This refers to the specific steps taken during the experiment.
* Research: This emphasizes a broader, more in-depth exploration of a scientific topic.
More informal:
* Test: This is a simple and straightforward synonym for experiment.
* Trial and error: This suggests a more exploratory approach, where you're trying different things to see what works.
* Exploration: This emphasizes the process of discovering new information or insights.
* Exploration: This suggests a more open-ended and less structured approach to the project.
The best word to use will depend on the specific context of your science project.