coo vs groaning

coo

noun
  • The murmuring sound made by a dove or pigeon. 

  • An expression of pleasure made by a person. 

adj
  • Cool. 

intj
  • An expression of approval, fright, surprise, etc. 

verb
  • To speak in an admiring fashion, to be enthusiastic about. 

  • To make a soft murmuring sound, as a pigeon. 

groaning

noun
  • A low sound associated with extended suffering, sorrow, and toil. 

adj
  • Heavily laden, as if to creak under the strain. 

  • That groans. 

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