courser vs rocker

courser

noun
  • A stone used in building a course. 

  • A person who practises coursing. 

  • Any of several species of bird in the genera Cursorius or Rhinoptilus of the family Glareolidae. 

  • A dog used for coursing. 

  • A racehorse or a charger. 

  • A hunter. 

rocker

noun
  • A rock shaft. 

  • A rocking chair. 

  • A rock music song. 

  • A curved piece of wood attached to the bottom of a rocking chair or cradle that enables it to rock back and forth. 

  • A skate with a curved blade, somewhat resembling in shape the rocker of a cradle. 

  • The breve below as in ḫ. 

  • A kind of electrical switch with a spring-loaded actuator. 

  • Someone passionate about rock music. 

  • One who rocks something. 

  • A tool with small teeth that roughens a metal plate to produce tonality in mezzotints. 

  • A curved line accompanying the chevrons that denote rank, qualifying the rank with a grade. 

  • A member of a British subculture of the 1960s, opposed to the mods, who dressed in black leather and were interested in 1950s music. 

  • The lengthwise curvature of a surfboard. (More rocker is a more curved board.) 

  • A musician who plays rock music. 

  • Any implement or machine working with a rocking motion, such as a trough mounted on rockers for separating gold dust from gravel, etc., by agitation in water. 

  • A rocking horse. 

  • A rocker board. 

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