bead vs perforator

bead

noun
  • A small, round object with a hole to allow it to be threaded on a cord or wire, particularly for decorative purposes. 

  • A narrow molding with semicircular section. 

  • A bubble, in spirits. 

  • Each in a string of small balls making up the rosary or paternoster. 

  • Knowledge sufficient to direct one's activities to a purpose. 

  • A small, round ball at the end of a barrel of a gun used for aiming. 

  • A small drop of water or other liquid. 

  • A rigid edge of a tire that mounts it on a wheel; tire bead. 

  • Various small, round solid objects. 

verb
  • To cause beads to form on (something). 

  • To apply beads to. 

  • To form into a bead. 

perforator

noun
  • A tool or machine that makes holes, or perforates, materials such as paper and card. 

  • A perforating artery or vein 

  • A machine that can bore a tunnel underground 

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