apo- vs at bay

apo-

prefix
  • the apoprotein form of the protein 

  • derived from, or related to 

  • away from, or separate 

  • without, or lacking 

at bay

prep
  • Of an animal, especially a docile animal in contrast to a predatory animal which would be blazoned statant: standing, in profile toward dexter, with all four feet on the ground. (If gazing at the viewer, the animal is at gaze.) 

  • Unable to come closer; at a distance. 

  • Cornered; unable to flee. 

How often have the words apo- and at bay occurred in a corpus of books? (source: Google Ngram Viewer )