ambulate vs lumber

ambulate

verb
  • To walk; to relocate oneself under the power of one's own legs. 

lumber

verb
  • To move clumsily and heavily; to move slowly. 

  • To fill or encumber with lumber. 

  • To heap together in disorder. 

  • To load down with things, to fill, to encumber, to impose an unwanted burden on. 

noun
  • An erect penis. 

  • Useless or cumbrous material. 

  • A baseball bat. 

  • Wood sawn into planks or otherwise prepared for sale or use, especially as a building material. 

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