scrap vs sluice box

scrap

noun
  • Discarded objects (especially metal) that may be dismantled to recover their constituent materials, junk. 

  • Loose-leaf tobacco of a low grade, such as sweepings left over from handling higher grades. 

  • A (small) piece; a fragment; a detached, incomplete portion. 

  • A fight, tussle, skirmish. 

  • The crisp substance that remains after drying out animal fat. 

  • The smallest amount. 

  • A piece of deep-fried batter left over from frying fish, sometimes sold with chips. 

  • A Hispanic criminal, especially a Mexican or one affiliated with the Sureno gang. 

  • Leftover food. 

verb
  • To discard. 

  • To make into scrap. 

  • to fight 

  • To stop working on indefinitely. 

  • To scrapbook; to create scrapbooks. 

  • To dispose of at a scrapyard. 

sluice box

noun
  • A box with riffles along the bottom, used to trap heavier gold particles as water washes them and the other material along the box. 

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