direction vs directional

direction

noun
  • A theoretical line (physically or mentally) followed from a point of origin or towards a destination. May be relative (e.g. up, left, outbound, dorsal), geographical (e.g. north), rotational (e.g. clockwise), or with respect to an object or location (e.g. toward Boston). 

  • Guidance, instruction. 

  • A general trend for future action. 

  • The work of the director in cinema or theater; the skill of directing a film, play etc. 

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 direction and directional occurred in a corpus of books? (source: Google Ngram Viewer )