million vs thousand

million

num
  • The cardinal number 1,000,000: 10⁶; a thousand thousand. 

  • An unspecified very large number. 

thousand

num
  • A numerical value equal to 1,000 = 10 × 100 = 10³ 

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