receptivity vs reverberation

receptivity

noun
  • The extent to which something is receptive. 

  • The state of being receptive. 

reverberation

noun
  • The reflection of light or heat; a reflection in, or as though in, a mirror. 

  • An echo, or a series of overlapping echoes. 

  • A violent oscillation or vibration. 

  • An evolving series of effects resulting from a particular event; a repercussion. 

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