The function of synonyms in english sentences

This article aims to review the investigations on synonymy in the English language ,therefore, the process deals with different linguistic descriptions relating scale of synonymy .The scale involves absolute synonymy(can be rarely found) cognitive synonymy (denotes with semememe) , near -synonymy(almost the same meaning).A number of examples are analyzed to detect near-synonymy from the Merriam- Webster’s dictionary. Finally, it is concerned that synonyms in Thesaurus dictionary are approximately near synonyms. Comparing and contrasting methods are used to fulfill the research.