lode vs lum

lode

noun
  • A watercourse. 

  • A vein of metallic ore that lies within definite boundaries, or within a fissure. 

  • A rich source of supply. 

lum

noun
  • A deep pool, especially one in a riverbed. 

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

  • A ventilating chimney over the shaft of a mine. 

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

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