thou vs you

thou

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

  • To use the word 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.). 

you

verb
  • To address (a person) using the pronoun you (in the past, especially to use you rather than thou, when you was considered more formal). 

det
  • Used before epithets, describing the person being addressed, for emphasis. 

  • The individual or group spoken or written to. 

pron
  • Anyone, one; an unspecified individual or group of individuals (as subject or object). 

  • (To) yourselves, (to) yourself. 

  • The people spoken to or written to, as a subject. (Replacing ye.) 

  • The person spoken to or written to, as an object. (Replacing thee; originally as a mark of respect.) 

  • The people spoken, or written to, as an object. 

  • The person spoken to or written to, as a subject. (Originally as a mark of respect.) 

noun
  • The name of the Latin-script letter U. 

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