This is the 1318th most frequent Japanese word.
試験
"試験" means "exam" or "test."
試験 in this sentence refers to an academic examination that evaluates students' understanding of the subject.
学生たちは一生懸命試験勉強をします。
The students intensely study for the exam.
試験 here means testing or assessing in a non-academic context, such as evaluating the functionality of a project.
そのプロジェクトを完成させるため、試験を行いました。
To complete the project, tests were conducted.
試験 denotes clinical trials or experimental testing in the context of medicine and research.