Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.
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Question: Category: poker 
Words: call, sail, deck, board, queen

Answer: sail


Question: Category: personal characteristic 
Words: ethical, tropical, unflappalbe, cool, optimist

Answer: tropical


Question: Category: animal 
Words: train, fly, dive, jump, leap

Answer:
train