...English language which is spoken not only on ...British Isles has ... mixed vocabulary and contains a lot of ...words

 English language which is spoken not only on The British Isles has mixed vocabulary and contains a lot of words from different languages. Like any other language it contains so-called the  \"vogue\" words. What is good English is a question to which  number of answers can be given. But the language you use must suit the material you want to communicate.