A Comparison of Instructional Vocabulary in Shiraz and Parfa Series based on Word Frequency: A Corpus-Based Study

Today, we see fruitful efforts in the field of Persian language teaching; however, there are still shortcomings due to a lack of sufficient studies as well as fundamental research in this field. Word selection and scientific teaching of words are those areas that have ambiguities, such as the principles of selecting Persian language teaching words, word leveling, and how to teach them. lexical frequency and word applicability are two principles in teaching second or foreign-language words. This research aims to compare the frequency of educational words in the Shiraz and Parfa series, as well as the frequency with which their educational words appear. As a result, the lexical frequencies of these two sets were compared. The word frequency of these two sets was then compared to three lists of words. Data was analyzed using Microsoft Excel software, pivot tables, and formula writing methods. The results show that a total of 864 words, or more than 30% of the words in both sets, are shared. The Shiraz series contains 47.15 percent of its vocabulary in at least one list, while the Parfa series encompasses 38.75 percent of its vocabulary in at least one list. When the results are compared, the Shiraz series outperforms the Parfa series in terms of lexical frequency, with roughly half of its educational vocabulary appearing at a minimum in one of the selected frequency lists.