blend vs centralize

blend

verb
  • To mingle; to mix; to unite intimately; to pass or shade insensibly into each other. 

  • To be mingled or mixed. 

noun
  • A mixture of two or more things. 

  • A word formed by combining two other words; a grammatical contamination, portmanteau word. 

centralize

verb
  • To move things physically towards the centre; to consolidate or concentrate 

  • To move power to a single, central authority 

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