diagram vs nomogram

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. 

nomogram

noun
  • A diagram in which the relationship between three variables is represented by a straight line or curve for each variable; the value of the third variable corresponding to particular values of the first two is obtained by drawing a straight line through the points on the first two curves that represent particular values of the first two variables and noting the point at which the line intersects the third line or curve. 

verb
  • To represent as a nomogram. 

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