frequent vs frequentative

frequent

adj
  • Addicted to any course of conduct; inclined to indulge in any practice; habitual; persistent. 

  • Done or occurring often; common. 

  • Occurring at short intervals. 

verb
  • To visit often. 

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. 

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