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The common name " sweet gum " refers to the species ' " sweetish gum " , contrasting with the black gum " ( Nyssa sylvatica ) " , only distantly related , with which the sweet gum overlaps broadly in range .
 black gum " ( Nyssa sylvatica ) "
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:
 black gum " ( Nyssa sylvatica ) "