contain vs foster

contain

verb
  • To include as a part. 

  • To put constraints upon; to restrain; to confine; to keep within bounds. 

  • To hold inside. 

  • To have as an element or subset. 

foster

noun
  • A foster parent. 

  • The care given to another; guardianship. 

adj
  • Related by such care. 

  • Receiving such care. 

  • Providing parental care to children not related to oneself. 

verb
  • To cultivate and grow something. 

  • To nurture or bring up offspring, or to provide similar parental care to an unrelated child. 

  • To nurse or cherish something. 

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