Book excerpt: Essay from the year 2017 in the subject English Language and Literature Studies - Linguistics, grade: 2.7, Education University of Hong Kong (Department of English Language Education), course: ENG2347 Words and Their Meanings, language: English, abstract: Language change and variation is a problematic issue to teachers because it tries to destandardize a language and cause trouble in students’ language learning. This essay focuses is divided into four parts. It will first define the difference between lexical change and lexical variation in English, then it would investigate in the the reasons why there are such lexical changes. After lexical change, lexical variations would be analyzed according to their characteristics and taxonomized into different types. The essay would end with an educational implication relating to teaching of vocabulary.