synonymy

noun7

1. •
   A certain degree of similarity between the meaning(s) of several (synonymous) words or phrases. (See Usage notes below.)
2. •
   A list or collection of synonyms, often compared and contrasted.
3. •
   A system of synonyms.
4. •
   A group or list of synonyms.

   • The synonymy of Tachina is extensive.
   • Descriptions are followed by a synonymy of the names that have been applied in the literature .
5. •
   The state of not being the name to be used, of being a synonym.

   • In 1924 this name was reduced to synonymy.
6. •
   The study of synonyms.
7. •
   (rhetoric) The use of synonyms to clarify or explain one's meaning.