inequality vs synonym

inequality

noun
  • A statement that of two quantities one is specifically less than (or greater than) another. Symbol: < or ≤ or > or ≥ or ne , as appropriate. 

  • The inequality in living standards led to a civil war as the have nots rebelled. 

  • An unfair, not equal, state. 

synonym

noun
  • An alternative (often shorter) name defined for an object in a database. 

  • Any name for a taxon, usually a validly published, formally accepted one, but often also an unpublished name. 

  • A word whose meaning is the same as that of another word. 

  • A word or phrase with a meaning that is the same as, or very similar to, another word or phrase. 

  • Any of the formal names for a taxon, including the valid name (i.e. the senior synonym). 

How often have the words inequality and synonym occurred in a corpus of books? (source: Google Ngram Viewer )