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Within a single language community some of the slang terms vary across social , ethnic , economic , and geographic strata , but others have become the dominant way of referring to the currency and are regarded as mainstream , acceptable language ( for example , " buck " for a dollar or similar currency in various nations including Australia , Canada , New Zealand , South Africa , Nigeria and the United States ) .
 Australia, Canada, New Zealand, South Africa, Nigeria, United States
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:
 Australia, Canada, New Zealand, South Africa, Nigeria, United States