necessity vs supplement

necessity

noun
  • Something necessary; a requisite; something indispensable. 

  • Something which makes an act or an event unavoidable; an irresistible force; overruling power. 

  • Greater utilitarian good; used in justification of a criminal act. 

  • Indispensable requirements (of life). 

  • The negation of freedom in voluntary action; the subjection of all phenomena, whether material or spiritual, to inevitable causation; necessitarianism. 

  • The condition of being needy; desperate need; lack. 

  • The quality or state of being necessary, unavoidable, or absolutely requisite. 

supplement

noun
  • Something added, especially to make up for a deficiency. 

  • A vitamin, herbal extract or chemical compound ingested to meet dietary deficiencies or enhance muscular development. 

  • An additional section of a newspaper devoted to a specific subject. 

  • An angle that, when added to a given angle, makes 180°; a supplementary angle. 

  • A surcharge, additional cost, especially for food in a restaurant. 

  • An extension to a document or publication that adds information, corrects errors or brings up to date. 

verb
  • To provide or make a supplement to something. 

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