exponent vs marcher

exponent

noun
  • One who expounds, represents or advocates. 

  • The part of a floating-point number that represents its exponent value. 

  • The number by which a value (called the base) is said to be raised to a power in exponentiation: for example, the 3 in 2³=8. 

  • A manifestation of a morphosyntactic property. 

marcher

noun
  • One who marches; one who participates in a march. 

  • An inhabitant of a march (border country); specifically, a marcher lord. 

  • A border territory, a march (now only in (attributive) use). 

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