eponym vs nameword

eponym

noun
  • A real or fictitious person's name that has given rise to the name of a particular item. 

  • A word formed from a real or fictive person’s name. 

  • A word formed from a real or fictive place or thing. 

nameword

noun
  • A designation or name given to an object, person or location. 

  • A noun. 

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