language vs usage

language

noun
  • A body of words, and set of methods of combining them (called a grammar), understood by a community and used as a form of communication. 

  • A computer language; a machine language. 

  • A body of sounds, signs and/or signals by which animals communicate, and by which plants are sometimes also thought to communicate. 

  • The particular words used in a speech or a passage of text. 

  • Profanity. 

  • A sublanguage: the slang of a particular community or jargon of a particular specialist field. 

  • Manner of expression. 

  • The ability to communicate using words. 

  • The expression of thought (the communication of meaning) in a specified way; that which communicates something, as language does. 

  • A languet, a flat plate in or below the flue pipe of an organ. 

verb
  • To communicate by language; to express in language. 

intj
  • An admonishment said in response to vulgar language. 

usage

noun
  • The established custom of using language; the ways and contexts in which spoken and written words are used, especially by a certain group of people or in a certain region. 

  • Custom, tradition. 

  • A custom or established practice. 

  • The act of using something; use, employment. 

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