词or词汇or单词

Most of the time we say 單字 Dan Zi. (This is by far the most common way that me and my friends and everyone else would say) But actually it doesn't matter, 單字、字彙、辭彙、詞彙 would be understood by the native Chinese speakers :D (Just sharing my own opinion, it might not be 100% professional but it's a good way of communicating with people.^^ )

词汇 = cí-huì

词汇。I think 单词 means word.

詞彙（traditional) 词汇 (Simplified) Cíhuì = (Pinyin) https://translate.google.com/#en/zh-CN/vocabulary This is a question for Google translate. download English/Chinese dictionary on your phone https://play.google.com/store/apps/details?id=com.pleco.chinesesystem&hl=en https://play.google.com/store/apps/details?id=com.molatra.trainchinese&hl=en The second dictionary has excellent pronunciation. Both can search English or Chinese and both give example sentences, including pinyin