em vs thou

em

noun
  • A unit of measurement equal to the height of the type in use. 

  • The name of the Cyrillic script letter М / м. 

  • The name of the Latin-script letter M. 

pron
  • A gender-neutral third-person singular object pronoun, the objective case of ey, equivalent to the singular them and coordinate with him and her. 

intj
  • a form of hesitant speech, or an expression of uncertainty; um; umm; erm 

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 em and thou occurred in a corpus of books? (source: Google Ngram Viewer )