bar chart vs histogram

bar chart

noun
  • A graph in the form of boxes of different heights, with each box representing a different value or category of data, and the heights representing frequencies. 

histogram

noun
  • A graphical display of numerical data in the form of upright bars, with the area of each bar representing frequency. 

verb
  • To represent (data) as a histogram. 

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