plank vs plonk

plank

verb
  • To lay down, as on a plank or table; to stake or pay cash. 

  • To cover something with planking. 

  • To pose for a photograph while lying rigid, face down, arms at side, in an unusual place. 

  • To harden, as hat bodies, by felting. 

  • To bake (fish, etc.) on a piece of cedar lumber. 

  • To splice together the ends of slivers of wool, for subsequent drawing. 

noun
  • Physical exercise in which one holds a pushup position for a measured length of time. 

  • A stupid person, idiot. 

  • A long, broad and thick piece of timber, as opposed to a board which is less thick. 

  • That which supports or upholds. 

  • A political issue that is of concern to a faction or a party of the people and the political position that is taken on that issue. 

plonk

verb
  • To set or toss (something) down carelessly. 

  • To sit down heavily and without ceremony. 

  • To automatically ignore a particular poster. 

intj
  • The sound made by something solid landing. 

  • The supposed sound of adding a user to one's killfile. 

adv
  • Precisely and forcefully. 

noun
  • Cheap or inferior everyday wine. 

  • AC Plonk 

  • A female police constable. 

  • The sound of something solid landing. 

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