HSK is not only a popular test, it’s also used by many students as a guide for which words to learn. But the HSK lists don’t contain all common words, so it raises the question which words are missing or delayed in the HSK word lists. This article gives one answer to this question, showing that certain categories of words are missing entirely, such as profanity, place names and names for things foreign in China. As a student, you probably want to learn these, so browsing through the list of missing words could be helpful!