beck vs rivulet

beck

noun
  • A stream or small river. 

  • A vat. 

  • A significant nod, or motion of the head or hand, especially as a call or command. 

rivulet

noun
  • A small brook or stream; a streamlet; a gill. 

  • Perizoma affinitatum, a geometrid moth. 

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