coeval vs modern-day

coeval

adj
  • Of the same age; contemporary. 

noun
  • Something of the same era. 

  • Somebody of the same age. 

modern-day

adj
  • Current; of the present. 

  • Designating a present-day version of someone or something in history. 

How often have the words coeval and modern-day occurred in a corpus of books? (source: Google Ngram Viewer )