27971
As in Mycenaean Greek , Homer used the Greek word to mean ivory , but after the time of Herodotus , it also referred to the animal .
 Homer, Herodotus
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Homer, Herodotus