mil vs thou

mil

noun
  • A unit of measurement equal to ¹⁄₁₀₀₀ of an inch (25.4 µm), usually used for thin objects, such as sheets of plastic. 

  • An angular mil, a unit of angular measurement equal to ¹⁄₆₄₀₀ of a complete circle. At 1000 metres one mil subtends about one metre (0.98 m). Also ¹⁄₆₀₀₀ and ¹⁄₆₃₀₀ are used in other countries. 

  • a former subdivision (¹⁄₁₀₀₀) of the Maltese lira 

thou

noun
  • A unit of length equal to one-thousandth of an inch (25.4 µm). 

  • A thousand, especially a thousand of some currency (dollars, pounds sterling, etc.). 

verb
  • To use the word thou. 

  • To address (a person) using the pronoun thou, especially as an expression of contempt or familiarity. 

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