damsel vs water nymph

damsel

noun
  • A young woman (of noble birth). 

  • A girl; a maiden (without sexual experience). 

  • A young woman who is not married. 

  • A chattering damsel (component of a mill). 

  • An unmarried lady-in-waiting. 

water nymph

noun
  • A female spirit presiding over fountains, wells, streams, etc. 

  • Any of various aquatic plants of the genus Najas. 

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