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.

Q: Category: measurement unit 
Words: ounce, foot, kilometer, milimeter, heel

A: heel
****
Q: Category: store status 
Words: shut, locked, near, out of service, close

A: near
****
Q: Category: weather 
Words: pale, deal, tangle, fair, 70

A:
pale
****