plain flour vs smeddum

plain flour

noun
  • exact synonym of flour 

  • A wheat flour with a medium gluten content, suitable for general use. Equivalent to American English "all-purpose flour". 

smeddum

noun
  • Fine powder; flour. 

  • A layer of clay or shale between two beds of coal. 

  • Smitham. 

  • Zest, energy; pluck; sagacity; quickness of apprehension; gumption; spirit; mettle. 

  • The powder or finest part of ground malt. 

  • Ore small enough to pass through the wire bottom of a sieve. 

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