congregate vs scrape together

congregate

verb
  • To collect into an assembly or assemblage; to bring into one place, or into a united body. 

  • To come together; to assemble; to meet. 

adj
  • Collective; assembled; compact. 

scrape together

verb
  • To collect, assemble or gather small amounts (especially of money), from various sources, with some difficulty 

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