deficient vs poor

deficient

adj
  • Insufficient or inadequate in amount. 

  • Lacking something essential; often construed with in. 

  • Of a number n, Having the sum of divisors σ(n)<2n, or, equivalently, the sum of proper divisors (or aliquot sum) s(n). 

noun
  • A person who is deficient. 

poor

adj
  • Inadequate, insufficient. 

  • Deficient in a specified way. 

  • Of low quality. 

  • Free from self-assertion; not proud or arrogant; meek. 

  • Used to express pity. 

  • With no or few possessions or money, particularly in relation to contemporaries who do have them. 

noun
  • A poor person. 

  • The poor people of a society or the world collectively, the poor class of a society. 

verb
  • Synonym of impoverish, to make poor. 

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