kilo- vs thousand

kilo-

prefix
  • Multiplying the unit to which it is attached by 2¹⁰ (1024) 

  • In the International System of Units and other metric systems of units, multiplying the unit to which it is attached by 1,000. Symbol: k 

thousand

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

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