The study of Farsi is so important due to current today differences between colloquial and written Farsi. There are many differences between these two types in many languages particularly from grammatical and lexical patterns that double the significance and necessity of separately studying these two. Based on this, the article reviews and analyzes words that are usually applied in conversation of Farsi speakers and are never or rarely used in written Farsi; and based on Boy’s view (2007) they are the result of word creation processes but not word formation. Following Boy view, under review data were categorized and reviewed based on the kind of word formation processes like shortening, combination, innovation, comparison, loaning, metaphorical expansion and phrasal conversion into four categories of Noun, Verb, Adjective and Adverb. The findings show that Shortening have the highest frequency (32.58 %) and phrasal conversion and combination have the lowest frequency (5.62 and 4.49 % respectively) in word formation.