ancestor vs infinitive

ancestor

noun
  • A word or phrase which serves as the origin of a term in another language. 

  • One who had the same role or function in former times. 

  • One from whom an estate has descended;—the correlative of heir. 

  • One from whom a person is descended, whether on the father's or mother's side, at any distance of time; a progenitor; a forefather. 

  • An earlier type; a progenitor 

verb
  • To be an ancestor of. 

infinitive

noun
  • A verbal noun formed from the infinitive of a verb. 

  • A non-finite verb form considered neutral with respect to inflection; depending on language variously found used with auxiliary verbs, in subordinate clauses, or acting as a gerund, and often as the dictionary form. 

  • The infinitive mood or mode (a grammatical mood). 

adj
  • Unlimited; not bounded or restricted; undefined. 

  • Formed with the infinitive. 

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