directional vs imperative

directional

adj
  • Of or relating to guidance or help. 

  • Indicating direction. 

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

imperative

adj
  • Of, or relating to the imperative mood. 

  • Having semantics that incorporates mutable variables. 

  • Expressing a command; authoritatively or absolutely directive. 

  • Essential; crucial; extremely important. 

noun
  • A verb in imperative mood. 

  • The grammatical mood expressing an order (see jussive). In English, the imperative form of a verb is the same as that of the bare infinitive. 

  • An essential action, a must: something which is imperative. 

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