imperative vs instant

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. 

instant

adj
  • Lasting for a short moment; momentary; short-lived. 

  • Present; current; extant. 

  • Very quickly and easily prepared. 

  • Of the current month. 

  • Occurring immediately; immediate; present. 

adv
  • At once; immediately. 

noun
  • A single, usually precise, point in time. 

  • A beverage or food which has been pre-processed to reduce preparation time, especially instant coffee. 

  • A very short period of time; a moment. 

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