hierarchical vs nonhierarchical

hierarchical

adj
  • Of or pertaining to an ecclesiastic or priestly order. 

  • Pertaining to a hierarchy. 

  • Classified or arranged according to various criteria into successive ranks or grades. 

nonhierarchical

adj
  • Classified or arranged so that a group or person has the same authority as everyone else; not hierarchical. 

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