irregular vs rat

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 

rat

noun
  • A person who routinely spends time at a particular location. 

  • Vagina. 

  • Any of the numerous members of several rodent families (e.g. voles and mice) that resemble true rats in appearance, usually having a pointy snout, a long, bare tail, and body length greater than about 12 cm, or 5 inches. 

  • A scratch or a score. 

  • A roll of material used to puff out the hair, which is turned over it. 

  • A scab: a worker who acts against trade union policies. 

  • A ration. 

  • A person who is known for betrayal; a scoundrel; a quisling. 

  • A medium-sized rodent belonging to the genus Rattus. 

  • A place in the sea with rapid currents and crags where a ship is likely to be torn apart in stormy weather. 

  • A wad of shed hair used as part of a hairstyle. 

  • An informant or snitch. 

verb
  • To scratch or score. 

  • To kill rats. 

  • Damn, drat, blast; used in oaths. 

  • To betray a person or party, especially by telling their secret to an authority or an enemy; to turn someone in. 

  • To work as a scab, going against trade union policies. 

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