The vocabulary may be composed of two or three words expressing one idea (Widistuti, 2011). However, Moon in Schmitt and McCarthy (1997: 105) has added that traditionally, vocabulary consists not only of single words: lexemes are often made up of strings of more than one word. Finally, Widistuti has concluded that vocabulary is a set of words that are taught in foreign language and which the speaker uses to express his ideas (2011).Vocabulary is important for the four learning skills: listening, speaking, reading, and writing. It is also vital for learning and understanding a second language. Both Coady and Huckin (1997: 5) concluded that vocabulary is the most important point for the learner of a new language to be able to acquire it easily.