gleaning vs groundskeeping

gleaning

noun
  • The catching of insects and other invertebrates by plucking them from within foliage, or sometimes from the ground. It may also be applied to where prey is picked off, or from within, natural and man-made surfaces such as rock faces and under the eaves of houses. 

  • The act of collecting leftover crops from farmers' fields after they have been commercially harvested or on fields where it is not economically profitable to harvest. 

  • Something learned by gleaning. 

groundskeeping

noun
  • The activity of tending an area of land for aesthetic or functional purposes; typically as an employee of a person or institution 

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