dod vs nubble

dod

noun

  • lump 

  • sulk, huff 

verb

  • to cut off, as wool from sheep's tails, or horns from a cattle; to lop or clip off 

nubble

noun

  • A small knob or lump. 

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