synonymy

noun

1. (countable, uncountable)A certain degree of similarity between the meaning(s) of several (synonymous) words or phrases. (See Usage notes below.)
2. (countable, uncountable)A list or collection of synonyms, often compared and contrasted.
3. (countable, rhetoric, uncountable)The use of synonyms to clarify or explain one's meaning.
4. (countable, uncountable)The study of synonyms.
5. (countable, uncountable)A system of synonyms.
6. (countable, uncountable)The state of not being the name to be used, of being a synonym.

   “sink into synonymy”

   “In 1924 this name was reduced to synonymy.”

7. (broadly, countable, uncountable)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 .”