irregular vs legionary

irregular

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

  • One who does not regularly attend a venue. 

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 

legionary

noun
  • A person who is neither a citizen nor colonial/imperial subject of the state whose military they join. 

  • A soldier belonging to a legion; a professional soldier of the ancient Roman army. 

  • A member of a legion, such as the American Legion, or of any organization containing the term legion in its title (e.g. the French Foreign Legion). 

adj
  • Relating to, or consisting of, a legion or legions. 

  • Containing a great number. 

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