foghorn vs fogsignal

foghorn

noun
  • A strong gossiper. 

  • A very loud low-pitched horn, used especially in lighthouses and on large boats. 

verb
  • To shout or bellow in a loud, deep voice 

  • To sound a foghorn 

fogsignal

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