expression vs lexeme

expression

noun
  • An arrangement of symbols denoting values, operations performed on them, and grouping symbols. 

  • A specific blend of whisky. 

  • A colloquialism or idiom. 

  • The action of expressing thoughts, ideas, feelings, etc. 

  • The process of translating a gene into a protein. 

  • A facial appearance usually associated with an emotion. 

  • (manufacturing) The act of pressing or squeezing out. 

  • A particular way of phrasing an idea. 

  • A piece of code in a high-level language that returns a value. 

  • The tone of voice or sound in music. 

  • emotional involvement or engagement in a text read aloud rendered by the voice of the reciter or the reader 

lexeme

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

  • 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. 

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