idiom vs lexeme

idiom

noun
  • A manner of speaking, a mode of expression peculiar to a language, language family, or group of people. 

  • An artistic style (for example, in art, architecture, or music); an instance of such a style. 

  • An established phrasal expression whose meaning may not be deducible from the literal meanings of its component words. 

  • A programming construct or phraseology that is characteristic of the language. 

  • A language or language variety; specifically, a restricted dialect used in a given historical period, context etc. 

lexeme

noun
  • The word-form chosen to represent such a set or family. 

  • The set itself; a lexemic family. 

  • The abstract minimum unit of language or meaning that underlies such a set. 

  • An individual instance of a continuous character sequence without spaces, used in lexical analysis (see token). 

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