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the boat was one of the world ' s most luxurious yachts when it was launched some 20 years ago .
 the boat, one of the world ' s most luxurious yachts when it was launched some 20 years ago, the world ' s most luxurious yachts, it, the world
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 the boat, one of the world ' s most luxurious yachts when it was launched some 20 years ago, the world ' s most luxurious yachts, it, the world