brushing vs paintbrush

brushing

noun
  • Material removed by brushing. 

  • An instance of brushing. 

  • A fraudulent technique in which an online seller sends out fake orders (such as empty boxes) and adds positive reviews about those orders, ostensibly from the recipient. 

paintbrush

noun
  • A thin brush for applying paint. 

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