absinthe vs absinthium

absinthe

noun

  • The herb absinthium Artemisia absinthium (grande wormwood); essence of wormwood. 

  • Bitterness; sorrow. 

  • A moderate yellow green. 

  • A distilled, highly alcoholic, anise-flavored liquor originally made from grande wormwood, anise, and other herbs. 

  • absinthe green 

  • Sagebrush. 

absinthium

noun

  • The dried leaves and flowering tops of the wormwood plant. 

  • absinthe oil 

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