outrigger vs topmast

outrigger

noun
  • Any of various projecting beams or spars that provide support for a sailing ship's mast. 

  • An outrigger canoe or boat. 

  • A long thin timber, pontoon, or other float attached parallel to a canoe or boat by projecting struts as a means of preventing tipping or capsizing. 

  • An iron bracket or brace for an oarlock projecting from the side of a rowing boat. 

  • An extension mechanism, often retractable when not in use, on a boat, vehicle, or structure which helps to stabilize it to keep it from tipping over. 

  • A type of ski pole, with skis attached at the bottom, instead of the spike/pick found on a normal pole. It is used in downhill skiing variants of para-skiing, especially those that use a sit-ski, such as the monoski. 

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 outrigger and topmast occurred in a corpus of books? (source: Google Ngram Viewer )