barbell vs mullion

barbell

noun
  • A wide steel bar with premeasured weights affixed to either end, with the central span open for the hands of the weightlifter. 

  • A piece of jewellery composed of a straight bar with a bead on each end, used as a piercing. 

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 barbell and mullion occurred in a corpus of books? (source: Google Ngram Viewer )