dibble vs trephine

dibble

verb
  • To dib or dip frequently, as in angling. 

  • To make holes or plant seeds using, or as if using, a dibble. 

  • To use a dibble; to make holes in the soil. 

noun
  • A pointed implement used to make holes in the ground in which to set out plants or to plant seeds. 

  • A police officer, especially one serving with Greater Manchester Police. 

  • Preceded by the: the police. 

trephine

verb
  • To perforate with a trephine. 

  • To use a trephine during surgery. 

noun
  • A surgical instrument with a cylindrical blade used to remove a circular section of tissue, f.e. bone or cornea; a trepan. 

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