“…A learner must know all kinds of associated knowledge of each word including knowledge related to its pronunciation, spelling, register, stylistic, and morphological features (Haastrup & Henriksen, 2000;Meara, 1996;Nation, 1990;Richards, 1976) as well as the knowledge of the word's syntactic and semantic relationships with other words in the language (i.e., its collocational meanings, antonymy, synonymy, and hyponymy) (Chapelle, 1994;Henriksen, 1999;Read, 2000). But, most commonly, researchers tend to view vocabulary knowledge as a dichotomy of breadth (how many words are known) and depth (how well is a word known) (Greidanus & Nienhuis , 2001;Read , 2000;Vermmer, 2001;Wolter, 2001) As to teacher's feedback in language classroom, unfortunately, explicit teaching of vocabulary has been almost neglected and research conducted so far have been mostly in writing and speaking areas (e.g., Qian,1999Qian, , 2002Li, 2003). In Iran, for example, only little research has been done on the role of corrective feedback in vocabulary learning (e.g.…”