housecat vs wildcat

housecat

noun
  • A pet cat that is not allowed outside 

wildcat

noun
  • Any feral cat. 

  • A bobcat (Lynx rufus) or other similar New World species of lynx. 

  • A person who acts like a wildcat, (usually) a violent and easily-angered person or a sexually vigorous one. 

  • An offensive formation with an unbalanced line and a snap directly to the running back rather than the quarterback. 

  • A wheel that can be adjusted so as to revolve either with or on the shaft of a capstan. 

  • Felis silvestris, a common small Old World wild cat somewhat larger than a house cat. 

verb
  • To drill for oil in an area where no oil has been found before. 

adj
  • Unauthorized by the proper authorities. 

  • Of or concerning businesses operating outside standard or legitimate practice, especially 

  • Of or concerning customized or hand-made cartridges. 

  • Of or concerning oil exploration in new areas, (particularly) small, independent operations. 

  • Of or concerning actions undertaken by workers without approval or in defiance of the formal leadership of their trade unions. 

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