need vs obviate

need

verb
  • To be required; to be necessary. 

  • To be obliged or required (to do something). 

  • To want strongly; to feel that one must have something. 

  • To have an absolute requirement for. 

noun
  • Lack of means of subsistence; poverty; indigence; destitution. 

  • A requirement for something; something needed. 

obviate

verb
  • To anticipate and prevent or bypass (something which would otherwise have been necessary or required). 

  • To avoid (a future problem or difficult situation). 

adj
  • Synonym of obviative 

noun
  • Synonym of obviative 

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