castoff vs cultch

castoff

noun
  • Something that has been rejected or discarded; a reject. 

adj
  • discarded, rejected. 

cultch

noun
  • Rubbish; debris; refuse. 

  • Empty oyster shells and other substances laid down on oyster grounds to furnish points for the attachment of the spawn of the oyster. 

  • Young or seed oysters together with the shells and other objects to which they are usually attached. 

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