frequentative vs instantaneous

frequentative

adj
  • Serving to express repetition of an action. 

noun
  • Any of a subclass of imperfective verbs that denote a repeated action, no longer productive in English, but found in e.g. Finnish, Latin, Russian, and Turkish. 

instantaneous

adj
  • Occurring, arising, or functioning without any delay; happening within an imperceptibly brief period of time. 

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