class vs heading

class

noun
  • A series of lessons covering a single subject. 

  • One of the sections into which a Methodist church or congregation is divided, supervised by a class leader. 

  • A group of students in a regularly scheduled meeting with a teacher. 

  • A rank in the classification of organisms, below phylum and above order; a taxon of that rank. 

  • A grouping of data values in an interval, often used for computation of a frequency distribution. 

  • A group of students who commenced or completed their education during a particular year. A school class. 

  • A collection of sets definable by a shared property. 

  • A group, collection, category or set sharing characteristics or attributes. 

  • Best of its kind. 

  • A set of objects having the same behavior (but typically differing in state), or a template defining such a set in terms of its common properties, functions, etc. 

  • The division of society into classes. 

  • Admirable behavior; elegance. 

  • A category of seats in an airplane, train or other means of mass transportation. 

  • A group of people subject to be conscripted in the same military draft, or more narrowly those persons actually conscripted in a particular draft. 

  • A social grouping, based on job, wealth, etc. In Britain, society is commonly split into three main classes: upper class, middle class and working class. 

adj
  • great; fabulous 

verb
  • To assign to a class; to classify. 

  • To be grouped or classed. 

  • To divide into classes, as students; to form into, or place in, a class or classes. 

heading

noun
  • The title or topic of a document, article, chapter, or of a section thereof. 

  • The end of a stone or brick which is presented outward. 

  • A strip of material at the hoist end of a flag, used for attaching the flag to its halyard. 

  • The direction into which a seagoing or airborne vessel's bow is pointing (apparent heading) and/or the direction into which it is actually moving relative to the ground (true heading) 

  • Material for the heads of casks, barrels, etc. 

  • A gallery, drift, or adit in a mine; also, the end of a drift or gallery; the vein above a drift. 

  • The extension of a line ruffling above the line of stitch. 

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