irregular vs sniper

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 

sniper

noun
  • Any attacker using a non-contact weapon against a specific target from a concealed position. 

  • A person or automated process set up by a person who or which attempts to win an online auction by placing a bid only seconds before the auction ends, leaving no time for other bidders to respond 

  • One who shoots from a concealed position. 

  • A hunter of snipe (the bird). 

  • A player who specializes in scoring goals. 

  • A person using long-range small arms for precise attacks from a concealed position. 

  • One who criticizes; a person who frequently snipes at others. 

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