bar chart vs diagram

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. 

diagram

noun
  • A graph or chart. 

  • A plan, drawing, sketch or outline to show how something works, or show the relationships between the parts of a whole. 

  • A functor from an index category to another category. The objects and morphisms of the index category need not have any internal substance, but rather merely outline the connective structure of at least some part of the diagram's codomain. If the index category is J and the codomain is C, then the diagram is said to be "of type J in C". 

  • Electrical diagrams show device interconnections. 

verb
  • To schedule the operations of a locomotive or train according to a diagram. 

  • To represent or indicate something using a diagram. 

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