E vs c-note

E

noun
  • The drug ecstasy (MDMA), particularly in pill form. 

  • The grade below D in some grading systems. In most such systems, it is a failing grade. 

  • The hormone estrogen/estradiol. (Contrast T, testosterone.) 

character
  • The fifth letter of the English alphabet, called e and written in the Latin script. 

name
  • A surname from Chinese. 

  • A state in ancient China of varying location in present-day Shanxi, Henan, and Hubei. 

  • Its capital, also known as Echeng and Ezhou. 

  • A Tai-Chinese mixed language spoken primarily in Rongshui Miao Autonomous County, Guangxi, China; Kjang E. 

  • A river in Highland council area, Scotland. 

symbol
  • East. 

c-note

noun
  • The lowest note of an instrument, written below the staff and the D note. 

  • A one-hundred dollar banknote. 

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