500,000 according to the number of words in the Oxford English Dictionary. There are supposedly another 500,000 uncataloged technical and scientific terms. By comparison, most estimates indicate that German has a vocabulary of about 185,000 words and French and Spanish have fewer than 100,000 words. 750 million peoples are using English. 350 million peoples are using in English as their mother tongue. 80% percent of information stored on the world’s computer in English. Default language of aviation and air traffic control in English. So we can say that English is the the richest vocabulary.