celery vs eau de nil

celery

noun

  • A yellow-green colour, like that of a celery. 

  • A European herb (Apium graveolens) of the carrot family. 

  • The stalks of this herb eaten as a vegetable. 

eau de nil

noun

  • A pale bluish green colour. 

adj

  • Of a pale bluish green colour. 

How often have the words celery and eau de nil occurred in a corpus of books? (source: Google Ngram Viewer )