I. INTRODUCTION According to Manser (1995: 461), Vocabulary is the total number of words in a language. While Morales (2004-2005) stated that vocabulary is a listing of the words used in some enterprise. Furthermore, Ur in Hidayati (2007: 7) stated that vocabularies are the words that are taught in the foreign language. From the opinions above, we can conclude that vocabulary is a listing of all words that are taught in the foreign language. Vocabulary refers to the words we must understand to communicate effectively. Many compelling reasons for providing students with instruction to build vocabulary, none is more important than the contribution of vocabulary knowledge to reading comprehension. Indeed, one of the most enduring findings in reading research is the extent to which students’ vocabulary knowledge relates to their reading comprehension. Most recently, the National Reading Panel (2000) concluded that comprehension development cannot be understood without a critical exami...