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The word " silphid " or " sylph " , first seen in the sixteenth century in Paracelsus ' works , refers to any race of spirits inhabiting the air and is described as mortal , but lacking soul .
 Paracelsus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Paracelsus