character vs irregular

character

noun
  • A person or individual, especially one who is unknown. 

  • Strength of mind; resolution; independence; individuality; moral strength. 

  • A complex number representing an element of a finite Abelian group. 

  • A being involved in the action of a story. 

  • Quality, position, rank, or capacity; quality or conduct with respect to a certain office or duty. 

  • One of the basic elements making up a text file or string: a code representing a printing character or a control character. 

  • A distinguishing feature; characteristic; trait; phene. 

  • A complex of traits marking a person, group, breed, or type. 

  • A written or printed symbol, or letter. 

  • A unique or extraordinary individual; a person characterized by peculiar or notable traits, especially charisma. 

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 

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