rivulet vs trickle

rivulet

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

  • Perizoma affinitatum, a geometrid moth. 

trickle

noun
  • A very thin river. 

  • A very thin flow; the act of trickling. 

verb
  • to flow in a very thin stream or drop continuously. 

  • To move or roll slowly. 

  • to pour a liquid in a very thin stream, or so that drops fall continuously. 

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