eight-oar vs eighth

eight-oar

noun
  • Synonym of eight (“narrow rowing boat with eight rowers”) 

eighth

noun
  • One of eight equal parts of a whole. 

  • The person or thing in the eighth position. 

  • An eighth of an ounce, or approximately 3.5 grams, of marijuana or other drugs. 

adj
  • The ordinal form of the number eight. 

verb
  • to divide by eight 

How often have the words eight-oar and eighth occurred in a corpus of books? (source: Google Ngram Viewer )