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: aesthetic characteristic 
Words: high quality, fine, attractive, alright, level

Answer: alright


Question: Category: boats 
Words: hull, deck, rudder, check, lifeline

Answer: check


Question: Category: bird 
Words: heron, tackle, mallet, egret, crane

Answer:
tackle