heed vs limbo

heed

verb
  • To mind; to regard with care; to take notice of; to attend to; to observe. 

noun
  • Careful attention. 

limbo

verb
  • To dance in this way. 

noun
  • A dance in which dancers take turns crossing under a horizontal bar or stick. The stick is lowered with each round, and the game is won by the player who passes under the bar in the lowest position. 

  • Any in-between place, state or condition of neglect or oblivion which results in an unresolved status, delay or deadlock. 

  • The place where innocent souls exist temporarily until they can enter heaven, notably those of the saints who died before the advent of Christ (limbus patruum) and those of unbaptized but innocent children (limbus infantum). 

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