creek vs estuary

creek

noun
  • A stream of water (often freshwater) smaller than a river and larger than a brook; in Australia, also used of river-sized bodies of water. 

  • Any turn or winding. 

  • A small inlet or bay, often saltwater, narrower and extending farther into the land than a cove; a recess in the shore of the sea, or of a river; the inner part of a port that is used as a dock for small boats. 

estuary

noun
  • An ocean inlet also fed by fresh river water. 

  • A coastal water body where ocean tides and river water merge, resulting in a brackish water zone. 

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