rivulet vs strait

rivulet

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

  • Perizoma affinitatum, a geometrid moth. 

strait

noun
  • A narrow channel of water connecting two larger bodies of water. 

  • A narrow pass, passage or street. 

  • A difficult position. 

  • A neck of land; an isthmus. 

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