lamp vs pharos

lamp

noun
  • A device containing oil, burnt through a wick for illumination; an oil lamp. 

  • A device that generates heat, light or other radiation. Especially an electric light bulb. 

  • A piece of furniture holding one or more electric light sockets. 

verb
  • To hunt at night using a lamp; see lamping. 

  • To make into a table lamp, said of a vase or urn, etc. 

  • To hang out or chill; to do nothing in particular. 

  • To hit, clout, belt, wallop. 

pharos

noun
  • That which stands out; a shining light. 

  • An ancient lighthouse or beacon to guide sailors. 

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