What is the Thai word for "exam"?

The Thai word for "exam" is indeed "สอบ" (sop). This term is commonly used in academic contexts to refer to assessments or tests that students take to evaluate their knowledge and understanding of subjects. In Thai, "สอบ" can be used in various educational settings, including schools and universities, and it is understood by speakers across different levels of education.

The other options do not align with the meaning of "exam." For example, "hong samut" refers to a classroom or examination room, "kan khon song" translates to "sending someone," which does not pertain to assessments, and "rot bas" means "bus," unrelated to any scholastic context. Understanding the specific vocabulary and context in which these words are used is crucial for effective communication in Thai.