dial vs directional

dial

noun
  • A panel on a radio etc showing wavelengths or channels; a knob that is turned to change the wavelength etc. 

  • A sundial. 

  • A miner's compass. 

  • A clock face. 

  • A person's face. 

  • A disk with finger holes on a telephone; used to select the number to be called. 

  • A graduated, circular scale over which a needle moves to show a measurement (such as speed). 

verb
  • To select a number, or to call someone, on a telephone. 

  • To control or select something with a dial, or (figuratively) as if with a dial. 

  • To use a dial or a telephone. 

directional

noun
  • Something that indicates direction, such as a vehicle's turn signal. 

adj
  • Indicating direction. 

  • Of or relating to guidance or help. 

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