crossbar vs mullion

crossbar

noun
  • Any transverse bar or piece, such as a bar across a door, or the iron bar or stock which passes through the shank of an anchor. 

  • The top of the goal structure. 

  • The top tube of a bicycle frame. 

verb
  • To mark with a pattern of transverse bars. 

mullion

noun
  • A vertical bar between the panes of glass or casements of a window or the panels of a screen. 

verb
  • To shape into divisions by means of mullions. 

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