thole vs topmast

thole

noun
  • A pin in the side of a boat which acts as a fulcrum for the oars. 

  • A pin, or handle, of the snath (shaft) of a scythe. 

  • A cupola, a dome, a rotunda; a tholus. 

verb
  • To endure, to put up with, to tolerate. 

topmast

noun
  • The mast below the topgallant mast in a square-rigged ship. 

  • The highest mast in a fore-and-aft-rigged ship. 

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