downcast vs lum

downcast

noun
  • A ventilating shaft down which the air passes in circulating through a mine. 

  • A cast from supertype to subtype. 

verb
  • To cast from supertype to subtype. 

  • To taunt; to reproach; to upbraid. 

adj
  • Feeling despondent. 

  • Looking downwards. 

lum

noun
  • A ventilating chimney over the shaft of a mine. 

  • A chimney; also, the top part of a chimney. 

  • A deep pool, especially one in a riverbed. 

  • A grove or wood; also, a woody valley. 

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