Morphemics helps us to study and analyze the structure of lexical items in a language. This area of linguistic study was first introduced in Russian texts by a linguist in 1881. The number of morphemes existing in Russian is more than that in Persian. Some Russian morphemes do not have any equivalents in Persian and vice versa. All Persian morphemes but ‘stems’ and ‘markers’ are meaningless while in Russian only ‘infixes’ are considered without any lexical and grammatical meaning. On the other hand, Persian affixes, except ‘enclitics’ cause a change in part of speech while this does not hold true in the case of some Russian affixes.