gulf vs hiatus

gulf

noun
  • A hollow place in the earth; an abyss; a deep chasm or basin. 

  • A portion of an ocean or sea extending into the land; a partially landlocked sea 

  • The bottom part of a list of those awarded a degree, for those who have only just passed. 

  • That which swallows irretrievably; a whirlpool; a sucking eddy. 

  • A large deposit of ore in a lode. 

  • A wide interval or gap; a separating space. 

  • A difference, especially a large difference, between groups. 

verb
  • To award a degree to somebody who has only just passed sufficiently. 

hiatus

noun
  • A gap in geological strata. 

  • A gap in a series, making it incomplete. 

  • An opening in an organ. 

  • A syllable break between two vowels, without an intervening consonant. (Compare diphthong.) 

  • An unexpected break from work. 

  • An interruption, break or pause. 

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