step ladder vs trestle

step ladder

noun
  • A ladder with steps or treads instead of rungs that is hinged in the middle to form an inverted V, with stays to keep the two halves at a fixed angle. 

  • The player over whom another player marks to take a spectacular mark. 

trestle

noun
  • A horizontal member supported near each end by a pair of divergent legs, such as sawhorses. 

  • A folding or fixed set of legs used to support a tabletop or planks. 

  • A framework, using spreading, divergent pairs of legs used to support a bridge. 

  • A trestle bridge. 

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