All languages have words that are divided into different groups. Examples for these can be synonyms, antonyms and paronyms. The article discusses similar and different points of synonyms and plesionymies. Synonyms are words that have similar meaning and different spelling which help to avoid repetition and improve the coherence of the speech while an important role in speech. Plesionymies are the words which can be called  near synonyms. They do not have the same meaning but they can be replaced by each other in many ways.