irregular vs wilderness

irregular

noun
  • One who does not regularly attend a venue. 

  • A soldier who is not a member of an official military force and who may not use regular army tactics. 

adj
  • without symmetry, regularity, or uniformity 

  • rough 

  • not regular; having sides that are not equal or angles that are not equal 

  • whose faces are not all regular polygons (or are not equally inclined to each other) 

  • nonstandard; not conforming to rules or expectations 

  • not following the regular or expected patterns of inflection in a given language 

wilderness

noun
  • A place or situation that is bewildering and in which one may get lost. 

  • Chiefly followed by of: a bewildering flock or throng; a large, often jumbled, collection of things. 

  • An ornamental part of a garden or park cultivated with trees and often a maze to evoke a natural wilderness. 

  • Uncultivated and unsettled land in its natural state inhabited by wild animals and with vegetation growing wild; (countable) a tract of such land; a waste or wild. 

  • A place other than land (for example, the air or sea) that is uncared for, and therefore devoted to disorder or wildness. 

  • Often preceded by in the: a situation of disfavour or lack of recognition; (specifically, politics) of a politician, political party, etc.: a situation of being out of office. 

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