moocher vs sponger

moocher

noun
  • A person having a tendency to take advantage of the help of others, especially if making little effort to help themselves. 

sponger

noun
  • A device for sponging cloth by means of a perforated adjustable cylinder. 

  • One who uses a sponge. 

  • A parasitic hanger-on. 

  • A person or vessel employed in gathering sponges from the sea. 

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