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.

Category: employment activity 
Words: scold, water, fire, praise, replace
water

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

Category: animal 
Words: swim, dive, fly, car, bee

car