buttonhole vs oral cavity

buttonhole

noun
  • The mouth and/or nose and/or eyes if appearing tiny. 

  • A small slot-like cut or incision, made for example by an accident with the scalpel. 

  • So shaped that it can be worn on a buttonhole or it is similar to a buttonhole. 

  • A flower worn in a buttonhole for decoration. 

  • A hole through which a button is pushed to secure a garment or some part of one. 

  • anus, batty hole. 

verb
  • To detain (a person) in conversation against their will. 

  • To cut one or more buttonholes (in). 

  • To sew by buttonhole stitch. 

  • To apply a flowery formation in. 

oral cavity

noun
  • The cavity of the mouth, especially the part of the mouth behind the gums and teeth that is bounded above by the hard and soft palates and below by the tongue and by the mucous membrane connecting it with the inner part of the mandible. 

  • The hollow on the lower surface of the head from which the proboscis protrudes. 

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