ground pounder vs musketeer

ground pounder

noun
  • A military soldier whose primary role is infantry or the use of ground-based materiel. 

musketeer

noun
  • A foot soldier armed with a musket. 

  • A comrade or fellow. 

  • In 17th- and 18th-century France, a member of the royal household bodyguard. 

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