mudflap vs visor

mudflap

noun
  • A rectangular flap mounted near the wheel of a truck to prevent mud from being thrown up onto the vehicle. 

visor

noun
  • A rigid adjustable flap on an automobile windshield that can shield the eyes of a driver from direct sunlight or glare. 

  • The fore piece of a cap, projecting over, and protecting the eyes. 

  • A mask for the face. 

  • A part of a helmet, arranged so as to lift or open, and so show the face. The openings for seeing and breathing are generally in it. 

  • Coordinate terms: bevor, buffe 

verb
  • To cover with, or as if with, a visor. 

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