cinder vs ember

cinder

noun
  • Partially or mostly burnt material that results from incomplete combustion of coal or wood etc. 

  • An ember. 

  • Slag from a metal furnace. 

verb
  • To cover with cinders. 

  • To reduce to cinders. 

ember

noun
  • A glowing piece of coal or wood; a hot coal. 

  • Smoldering ash. 

adj
  • Making a circuit of the year or the seasons; recurring in each quarter of the year, as certain religious days set apart for fasting and prayer. 

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