equestrian vs rocking horse

equestrian

noun
  • One who rides a horse. 

  • Synonym of eques 

adj
  • Of or relating to the ancient Roman class of equites. 

  • Of horseback riding or horseback riders. 

rocking horse

noun
  • a child’s toy consisting of a (usually wooden) horse mounted on a rocker or swing 

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