formulation vs lexeme

formulation

noun
  • A particular linguistic construction; a turn of phrase. 

  • A medicinal preparation. 

  • The act, process, or result of formulating or reducing to a formula. 

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 formulation and lexeme occurred in a corpus of books? (source: Google Ngram Viewer )